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HARTLEY UNIVERSITY COLLEGE, NORTHERN POLYTECHNIC
SOUTHAMPTON.

INSTITUTE,
PRINCIPAL-S. W. RICHARDSON, D.Sc. (Lond.), B.A., Trinity

HOLLOWAY, LONDON, N.
College, Cambridge.

(Close to Holloway Stn., G.N.R., and Highbury Stn., N.L.R SESSION 1905-6.

LONDON UNIVERSITY SCIENCE AND ENGINEERING Next SESSION commences on OCTOBER 2, 1905.

DEGREES.

Day and Evening Courses in the above under recognised teachers inCourses of Instruction are arranged to meet the requirements of Students preparing for the DEGREES of the LONDON UNIVERSITY, for the

MATHEMATICS, UNIVERSITIES of OXFORD and CAMBRIDGE, for the MEDICAL,

PHYSICS, ENGINEERING, and TEACHING PROFESSIONS, and for the

CHEMISTRY, CIVIL SERVICE.

ENGINEERING. Subjects.

Professors.

Separate Laboratories for Elementary, Advanced and Honours students, (Prof. W. F. Masom, M.A. (Camb.

exceptionally large and well equipped. Classics and English Literature...

and Lond.), Fellow of University
College, London, late Scholar of

RESEARCH.
St. John's College, Cambridge.
Prof. F. J. C. HEARNSHAW, M.A.

Special arrangements for students undertaking research during vacations History

Full particulars at the Institute or sent on receipt of postcard.
LL.M. (Camb.), B.A. (Lond.),
late Historical Scholar of Peter

REG. S. CLAY, D.Sc., Principal house, Cambridge.

Prof. L. J. LHUISSIER, M.A. (Camb. French and German and Lond.). B.ès L., B. ès Sc.

BEDFORD COLLEGE FOR WOMEN, (Prof. E. L. WATKIN, M.A. (Camb.), Mathematics ...

(UNIVERSITY OF LONDON.)
{late Scholar of St. John's College,
Cambridge.

YORK PLACE, BAKER STREET, LONDON, W. Physics and Electrical Engineer- THE PRINCIPAL.

The SESSION 1903-6 will open on THURSDAY, OCTOBER ing .. .. .. ***

(Prof. D. R. Boyd, D.Sc. (Glasgow), Students are requested to enter their names on Wednesday, Octobe: 4

Ph.D., F.I.C., late Examiner in Lectures are given in all branches of General and Higher Educatir. Chemistry... ... ... Chemistry for Glasgow Univer

Taken systematically, they form a connected and progressive Course, tu sity.

a single Course in an

any subject may be attended. Biology and Geology

Prof. F. CAVERS, D.Sc. (Lond.), Courses are held in preparation for all Examinations of the Universits .. .. A.R.C.S., F.L.S.

of London in Arts and Science, for the Teachers' Diploma (London) ar Civil and Mechanical Engineer- Prof. J. EUSTICE, B.Sc. (Lond.),

eachers' Certificate (Cambridge), and also a special Course ing ... ... ... ... ... AR.S.M., A.M.I.C.E.

Scientific Instruction in Hygiene. Education, Professor and Master | Exhibitioner, (F. FLETCHER, B.A., late Classical

Six Laboratories are open to Students for Practical Work. of Method...

Balliol College, ... ... . Oxford.

Two Entrance Scholarships will be offered for competition in Jane, 190

The Early English Text Society's Prize will be awarded in June, 1906 Particulars of the Scholarships and Exhibitions open for competition, and

Students can reside in the College.
Prospectuses of all Departments, may be obtained on application at the
College.

TRAINING DEPARTMENT FOR SECONDARY TEACHERS.

D. KIDDLE, Registrar. A Scholarship of the value of £20 for one year is offered for the CuaryAugust 21, 1905.

of Secondary Training, beginning in October, 1905.

The Scholarship will be awarded to the best candidate holding a degree ENGINEERING.

or equivalent in Arts or Science.

Applications should reach the HEAD OF THE TRAINING DEPARTMENT NORTHAMPTON INSTITUTE, not later than September 18. CLERKENWELL, LONDON, E.C.

BOROUGH POLYTECHNIC ENGINEERING DAY COURSES IN MECHANICAL,

INSTITUTE ELECTRICAL, AND HOROLOGICAL ENGINEERING.

(Five minutes from Blackfriars, Waterloo, and Westminster Bridgest FULL DAY COURSES in the THEORY and PRACTICE of the

103 BOROUGH ROAD, S.E. above subjects will commence on MONDAY, OCTOBER 2. 2005.

TECHNICAL CHEMISTRY AND ELECTROCHEMISTRY ENTRANCE EXAMINATION on WEDNESDAY and THURSDAY,

DAY COURSE. SEPTEMBER 27 and 28.

A complete Day Course extending over two years has been arranged in The Courses for Mechanical and Electrical Engineering include periods

Technical Chemistry. With the object of providing as complete a cour spent in Commercial Workshops, and extend over four years. They also

of training as possible, instruction will be given in MATHEMATICS prepare for the degree of B.Sc. in Engineering at the University of

PHYSICS. ENGINEERING DRAWING, PRACTICAL MECHAN London. Fees for either of these Courses, £15 or ku per annum.

ICS, FRENCH, GERMAN, METAL and WOOD WORKING, au Three Entrance Scholarships of the value of £52 each, giving free

in GENERAL CHEMISTRY, and throughout the Course parte * tuition for the full course in Mechanical or Electrical Engineering, will be attention will be paid to ELECTROCHEMISTRY, for which a Spel offered for competition at the Entrance Examination in September next. Laboratory has been fitted. Conditions can be obtained from the PRINCIPAL.

FEE FOR THE COURSE, OCTOBER TO JULY, LA Full particulars as to fees, dates, &c., and all information respecting the work of the Institute, can be obtained at the Institute or on appli Intending students must give evidence that they are capable of follosing cation to

the Course with advantage, or they may be required to attend a pre R. MULLINEUX WALMSLEY, D.Sc., Principal. liminary Course.

Full particulars can be obtained on application to

C. T. MILLIS, Principa MERCHANT VENTURERS'

WIGAN TECHNICAL COLLEGE, BRISTOL.

| MINING & TECHNICAL COLLEGE. PRINCIPAL-Prof. J. Wertheimer, B.Sc., B.A., F.I.C., F.C.S. ENGINEERING-Prof. J. MUNRO, A.R.C.S., M.I. Mech. E. ; Prof.

Principal-THOMAS T. RANKIN, C.E., B.Sc.,
D. ROBERTSON, B.Sc., A.I.E.E.

M. Inst. M.M., M.I.M.E.
CHEMISTRY-Prof. J. WerthEIMER, B.Sc., B.A., F.I.C., F.C.S.
Lecturer : G. P. DARNELL SMITH, B.Sc., F.I.C., F.C.S.

SANDWICH SYSTEM OF MINING TRAINING. MATHEMATICS-E. S. BOULTON, M.A. ; J. W. PULSFORD, B A.

DAY MINING COURSES. In addition to the above the College Staff includes seventy-nine Assistant

Opening date, MONDAY, OCTOBER 2, at 9 a.m. Lecturers, Demonstrators, and Skilled Artisans. There are eleven Labora

te Diploma Course extends over a period of three or four years tories, eight Workshops, Experimental Engines and Electric Light and

Two Prizes of 610 1os. each awarded annually Power Station.

Candidates for Colliery Managers' Certificates of Competeary bold COURSES for CIVIL. MECHANICAL, MINING and ELECTRI- the above Diploma will be exempt from two out of the five years' CAL ENGINEERS, CHEMIST'S, ARCHITECTS, and BUILDERS. I experience required by the Coal Mines Regulation Act.

UNIVERSITY OF LONDON-COURSES for MATRICULATION The Home Secretary has approved for the purposes of the Coal Me and INT. and FINAL B.Sc. (including the Engineering Degree).

Regulation Act (1887) Amendment Act, 1903, the Diplomas of this Colege

Prospectus post free on application to the PRINCIPAL, or FEE: TEN GUINEAS A YEAR.

T. RATCLIFFE ELLIS, Hop Sec Calendar (6d.) or short Prospectus (free) on application to the

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BIRKBECK COLLEGE

UU

s New Session begins Monday, October 2, 1905.

EAST LONDON COLLEGE

(LATE EAST LONDON TECHNICAL COLLEGE), BREAMS BUILDINGS, CHANCERY LANE, E.C.

MILE END ROAD, E.
FACULTY OF SCIENCE.

New SESSION commences SEPTEMBER 18.
DAY AND EVENING COURSES, under recognised Teachers of

SCIENCE AND TECHNICAL SIDE. the University of London.

Mathematics

AJ. L. S. HATTON, M.A., and Chemistry J. E. MACKENZIE, Ph.D., D.Sc.

*W. F. S. CHURCHILL, M.A. . 1H. WREN, Ph.D., B.A., B.Sc.

/*R. A. LEHFELDT, B.A., D.Sc., and

Physics
ALBERT GRIFFITHS, D.Sc.

* *W. H. WHITE, B.A., B.Sc. Physics ...

D. OWEN, B.A., B.Sc.
B. W. Clack, B.Sc.

Chemistry ...

T'J. T. HEWITT, M.A., D.Sc., Ph.D., ..

**and *C. SMITH, D.Sc. Mathematics ... E. H. SMART, M.A.

Botany

... *V. H. BLACKMAN, M.A. JA. B. RENDLE, M.A., D.Sc.

(D. A. Low, M.I.M.E., and Botany ... ... F. E. FRITSCH, Ph.D., B.Sc.

Engineering

* * J. A. DAVENPORT, M.Sc. Zoology ...

H. W. UNTHANK, B.A., B.Sc. Electrical Engineering ... ... *J. T. Morris, M.I.E.E. Goology & inora y ... Geo. F. HARRIS, F.G.S.

ARTS SIDE. Assaying, Motallurgy & Mining. Geo. PATCHIN, A.R.S.M.

1 . L. S. HATTON, M.A., and RESEARCH in Chemistry and Physics in well-equipped laboratories. Mathematics ... ... ... *W. F. S. CHURCHILL, M.A. French, German, Spanish, Russian, and Itallan Classes,

Latin and Greek

*F. R. EARP, M.A. EVENING CLASSES in Biology, Physiology, Practical Geometry,

English Language and Literature *KATE M. WARREN. Building and Machine Construction, Steam, Theoretical and Applied

History ... Mechanics.

*T. SECCOMBE, M.A.

" French ...

*W. G. HARTOG, B.A. Calendar 6d. (post free 5d.), on application to the SECRETARY.

German

... CONSTANCE B. Low, M.A. "Recognised Teacher of the University of London.

Fee for the full Day Course, 10 Guineas per Session. THE UNIVERSITY OF LIVERPOOL

Numerous Scholarships of the value of 640 per annum, and tenable at

the College for three years, are awarded by the Drapers' Company. SESSION 1905-6 COMMENCES OCTOBER 2.

Evening Courses for the Science and Engineering degrees are also held, FACULTY OF ENGINEERING.

the fees for which are from Two Guineas to Five Guineas per Session.

CALENDAR, post free 4jd., on application.
THE VICE-CHANCELLOR.
CHAIRMAN-PROFESSOR CAREY.

JOHN L. S. HATTON, M.A., Director of Studies.
DEAN-J. WEMYSS ANDERSON.
PROFESSORS AND LECTURERS.

WESTMINSTER HOSPITAL MEDICAL
Harrison Professor-W. H. WATKINSON,
ENGINEERING
M. Inst. C.E., M.I.Mech. E., M.I.E.E.

SCHOOL, ELECTROTECHNICS

David Jardine Professor-E.' W. Mar*** CHANT, D.Sc.

CAXTON STREET, S.W. MATHEMATICS

Professor F. S. CAREY, M.A.
PHYSICS ...

A SCHOOL OF THE UNIVERSITY OF LONDON.
(Lyon Jones Professor-L. R. WileER.
...
** FORCE, M.A.

The WINTER SESSION will commence on MONDAY, OCTOBER 2,
CHEMISTRY ... ..
Grant Professor-J. CAMPBELL BROWN,

1905. Scholarships of the aggregate value of £320 are offered to students D.Sc., F.C.S., É.I.C.

entering in October. Examination on September 26 and 27. Fees 11 RAILWAY ENGINEERING/Associate Professor-J. A. F. ASPINALL,

if paid in one sum on entrance. For University Students and those who M.last.C.E.

have completed their anatomical and physiological studies 70 Gns. Special MUNICIPAL

Associate Professor-J. A. BRODIE, opportunities for Clinical work and for holding the various hospital appoint. ENGINEERING. ... M. Inst.C.E.

ments. Dental students are specially provided for. MUNICIPAL ELECTRICAL Associate Professor - A. BROMLEY

Prospectus and further particulars may be obtained from the Dean. ENGINEERING... .. HOLMES, M. Inst.C.E., M.I.E.E. ENGINEERING DESI /Lecturer - J. WEMYSS ANDERSON,

Telegrams: “Clinic," London. Telephone : Victoria 765. AND DRAWING. . Assoc. M. Inst.C.E., M.I.Mech. E. APPLIED MECHANICS ... Lecturer-J. H. GRINDLEY, D.Sc.

UNDER THE AUSPICES OF His MAJESTY'S GOVERNMENT, The courses of study in the Faculty leading to the ordinary degree of Bachelor of Engineering or the certificate in Engineering are so arranged

THE LONDON SCHOOL OF TROPICAL as to afford a general scientific training for those intending to become

MEDICINE. engineers or to enter any allied profession. The Honours course enables students to specialise in some branch of the profession, and opportunities

(UNIVERSITY OF LONDON.) are afforded for post-graduate work and research. The special prospectus of the Faculty may be obtained on application to

CONNAUGHT ROAD, ALBERT DOCK, E. tbe REGISTRAR.

(IN CONNECTION WITH THE HOSPITALS OF THE SEAMEN'S

HOSPITAL SOCIETY.) BATTERSEA POLYTECHNIC, S.W.

The next SESSION commences on MONDAY, OCTOBER 2, 1905.

For Prospectus, Syllabus, and other particulars, apply to the Secretary,
Principal-SIDNEY H. Wells, Wh.Sc.,

P. Michelli, Esq., Seamen's Hospital, Greenwich, S.E.
A.M.I.C.E., A.M.I.M.E.
TERM begins MONDAY, SEPTEMBER 25.

THE UNIVERSITY OF LEEDS. Day and Evening Courses in preparation for London University

The next SESSION will begin on OCTOBER 2. Science and Engineering Degrees under recognised Teachers. Matricu.

University Degrees are conferred in Arts, Law, Science, and Medicine. lated Students attending these Courses are registered as Internal Students

The Classes also prepare for the following professions :--Chemistry, of the University

il. Mechanical, and Electrical Engineering. Mining, Textile Industries, Mechanical Engineering

The PRINCIPAL and J. W. BUTTOV,
A.R.C.S., A.M.I.M.E.

Dyeing, Leather Manufacture, Agriculture, School Teaching, Commerce,

Law, Medicine and Surgery. Electrical Engineering and, W. THOMSON, M.A., B.Sc.

Lyddon Hall has been licensed for the residence of students. Physics ... ... ... 1 (One Vacancy.)

Prospectus of any of the above may be had post free from the REGISTRAR. J. WILSON, M.Sc., and J. L. Chemistry

WEITE, D.Sc. Mathematics ..

. .

THE UNIVERSITY OF SHEFFIELD. G. E. St, L. CARSON, B.A., B.Sc. The Laboratories are also open for Research Work.

SESSION 1905-6. Technical Day College Courses in Mechanical, Electrical, and Motor The SESSION OPENS as follows:-Engineering, in Architectural and Constructional Work, and in Chemistry,

FACULTY OF APPLIED SCIENCE

September 11 Abridged Prospectus gratis on application.

FACULTY OF ARTS ...

October 4 Detailed Prospectus id., post free 3d., on application to the SECRETARY. FACULTY OF PURE SCIENCE ... .. October 4

FACULTY OF MEDICINE ...

October 4 Prospectuses may be had free on application.

W. M. GIBBONS, Registrar. AND OTHER ELEMENTARY AND ADVANCED EXAMS. Preparation by Correspondence and in Small Oral Classes. WANDSWORTH TECHNICAL Able staff of high qualifications. Single subjects may be taken-Mathematics, Physics, Chemistry,

INSTITUTE. Biology, Botany, &c.

ASSISTANT MASTER (Science Graduate) required, Physics and French and German for all exams.

Chemistry. Commencing salary, £150. Application Forms and statement Moderate Terins-Individual Assistance-Full Notes.

of duties to be obtained from the REGISTRAR. Address-Mr. H. J. SMITH, B.Sc. (Lond.), Kosebery House, Breams Buildings, Chancery Lane, London, E.C. I For other Scholastic Advertisements, see pages cc and ccii.

MATRIC., INTER., FINAL B.A. & B.SC.

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COACHING PRACTICA

SOUTH-WESTERN POLYTECHNIC, | THE SIR JOHN CASS TECHNICAL MANRESA ROAD, CHELSEA, S.W.

INSTITUTE, EVENING CLASSES commence SEPTEMBER 25.

JEWRY STREET, ALDGATE, E.C. DAY COLLEGE COURSES commence OCTOBER 2.

The Day College Courses consist of 30 hours per week, and are in pre. Principal ... Charles A. KEANE, M.Sc., Ph.D., FLC paration for London University degrees of B.Sc. in Mechanical and Elec EVENING CLASSES in CHEMISTRY, METALLI'RGY, irical Engineering, in Chemistry, Physics and Natural Science.

PHYSICS and MATHEMATICS designed to meet the requirements auf The composition fee for the Session of 3 terms is £15.

those engaged in CHEMICAL, METALLURGICAL and ELECTRICAL The Evening Classes consist of similar courses at much reduced rates. INDUSTRIES and in trades associated therewith. The Technical Day Courses are arranged to extend over 3 years and pre

CHARLES d. KKANE, M.Sc., Ph.D., F.I.C., anst pare for Engineering, Electrical, Chemical and Metallurgical professions.

Chemistry

TH. BURROWS, A.R.C.S., Ph.D., EIC. * W. H. ECCLES, D.Sc. Mathematics

Physics ...

R.S. WILLOWS, D.Sc., M.A.
... *
J. LISTER, A.R.C.S.

Metallurgy

C. O. BANNISTER, Assoc. R.S.M.
S. SKINNER, M.A.

Mathematics ... ... G. M. K. LEGGETT, B.A.
Physics .. .. "
W. H. ECCLES, D.Sc.

Every facility for special and advanced practical work in well-equippe
L. LOWNDS, B.Sc., Ph.D.

laboratories both in the afternoon and evening. * J. B. COLEMAN, A.R.C.S.

i Also preparation for the B.Sc. Examination of London Uni1. C. CROCKER, M.A.

versity under recognised teachers of the University. Chemistry F. H. Lowe, B.Sc.

Courses of Instruction in Glass Blowing will be given during the
C. W. Hale.

Session by Mr. A. C. Cossor.
W. E. OAKDEN.
4* H. B. LACEY.

NEW SESSION begins MONDAY, SEPTEMBER 25. Botany ... ... * T. G. HILL, A.R.C.S.

For details of the Classes apply at the Office of the Institute, or to Geology ... , A. J. MASLEN, F.L.S.

letter to the PRINCIPAL. W. W. F. PULLEN, A.M.I.C.E.

W. H. DAVISON, M.A., Clerk to the Governing Body
M.I.M.E., Wb.Sc.
Engineering

* A. MACKLOW SMITH.
H. AUGHTIE.

To SCIENCE and MATHL. MASTERS.-
A. J. MAKOWER, B.A.
Electrical Engineering ...

REQUIRED immediately, (1) Science Master for important Endowe, ... U. A. OSCHWALD, B.A. B. H. MORPHY, B.Sc.

School and Technical Institute. Chemistry and Physics Only 2" • Recognised Teacher of the University of London.

hours' work weekly. Salary, C200, non-resident. (2) Matbematica

Master for School in W. London, University man preferred Las.. The Laboratories and Workshops are open for Research under the

non-resident. -For particulars of the above and many other vacancedirection of the Principal and the Heads of Departments.

address GRIFFITHS, SMITH, POWELL AND SMITH, Tutorial Agert Further particula's may be obtained on application to the SECRETARY,

(Estd. 1833), 34 Bedford Street, Strand, London. who will send a full prospectus, post free, 4d. Prospectuses may be obtained at the office, price id. SIDNEY SKINNER, M.A., Principal. OUNDLE SCHOOL, NORTHANTS,

A DEMONSTRATOR in the ENGINEERING LABORATORY. (THEORY AND

and TEACHER of MECHANICAL and MACHINE DRAWIN, PRACTICE)

wanted. Experience in Workshop and Drawing Office, Commencin

salary, 150 to £200 a year. Applications, with copies of testimonials and In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for

references, to be sent to the HEADMASTER. MEDICAL EXAMS.

Especial Course of Instruction in THERAPEUTICS. PHARMA.
COLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY WELLINGBOROUGH TECHNICAL
EXAM.

INSTITUTE.
Mr. FREDERICK DAVIS, The Laboratories,

Wanted immediately, TEACHER OF ART for Day and Estning (Registered in Column B (Advanced Education), Teachers Registration Classes, and also for the Pupil Teachers' Centre. Time occupied abral Council, Board of Education, S.W.),

20 hours per week Annual salary, 4110. Applications must be receive

by September 28. 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C.

L.A. S. CAMPBELL, Secretary.

10 Vivian Road, Wellingborough. HARRIS INSTITUTE, PRESTON.

For other Scholastic Advertisements, see pages cc and cci. ASSISTANT MASTER required for School of Art. Specially qualified to teach Perspective and Geometry, and to assist in giving instruction to the students attending the Pupil Teacher Centre. The duties amount to about twenty hours a week, and opportunities will be afforded for private required for a responsible position in a works near London where study. Salary. 670. Applications, stating age, qualifications and previous

secret and patented processes are in operation. Commercing salary. experience, with three testimonials, to be forwarded to the undersigned

£200. Investment of £2000 necessary.--Address Box 1873, NATURE before October 4.

Othce.
T. R. JOLLY, Secretary and Registrar.

CHEMICAL BALANCE for Sale; short NORTHAMPTON INSTITUTE,

beam; by Bunge, Hamburg. In perfect condition ; very little tal.

Accept 61. Can be seen by arrangement with H. S. Jxross, LONDON, E.C.

19 Chesterford Gardens, Hampstead, N.W. The Governing Body invite applications for the appointment of INSTRUCTOR in MATHEMATICs in the Engineering Day Courses,

Attendance required for 2 hours on four mornings per week. Salary, £120 per session (October to July).

Forms of application (which should be returned at once) and further particulars can be obtained from

By E. L. N. ARMBRECHT.
R. MULLINEUX WALMSLEY, D.Sc., Principal.

Symbols. Atomic Weight, Discoverer, Isolater, Specif. Gravity, Prib :

Sourle, Melting Point, Properties, Salts of, Price, &c.
SOUTH-WESTERN POLYTECHNIC,

ARMBRECHT, NELSON & CO.,
MANRESA ROAD, CHELSEA.

71 & 73 Duke Street, Grosvenor Square, W. The Governing Body invite applications for the post of DEMON | N.B. - Sent Free on application. STRATOR in PHYSICS. The work of the Demonstrator will consist partly in conducting Phy-ics Classes of the Secondary Day School and partly in assisting in the adult Physics Classes in the Institute. A graduate

SEND FOR DETAILS OF OUR in Physics would receive preference. Commencing salary. 2120 per annum.

MICRO-SLIDE LENDING For form of application, to be returned by September 28, apply to the SECRETARY.

DEPARTMENT. CRAWFORD MUNICIPAL TECHNICAL

Covering every Branch of Natural Science.

SUBSCRIPTION €1:1:0 FOR 240 SLIDES INSTITUTE, CORK.

Over 58,000 Slides have already been circulated. WANTED immediately, an ASSISTANT HEAD MASTER Salary, IF The Boxes are accompanied by descriptions of their contents, £200. One holding the Electrical Engineering Diploma of a Technical

concisely written by well-known authorities in the different College with experience in Works and Teaching preferred

departments. Applications to E. A. O'KEEFFE, B.E., M.I.E.E., d.,

C. BAKER, 244 HIGH HOLBORN, LONDON, W.C.

TABLE OF RARE ELEMENTS

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HEELE'S FAMOUS SPECTROMETER. Price £10 10 0 Including dense flint glass prism, with micrometer movement, reading to 1 minute. Universally acknowledged to be the

most efficient instrument on the market. Also, smaller size, Price £6 nett, including two prisms, one being a hollow prism. As supplied to the Royal College of Science, Dublin, University College, Gower St., London County Council, St. Munchin's College, Limerick, and many other leading Institutes.

DELIVERY FROM STOCK. PETER HEELE, 115 High Holborn, W.C.

MAKER OF PHYSICAL, ASTRONOMICAL, AND OTHER INSTRUMENTS.

IMPORTANT REDUCTION IN PRICE.

SPINTHARISCOPE.

HOPKIN & WILLIAMS, Ltd.
16 CROSS STREET, HATTON CARDEN, LONDON, E.C.

Works-ILFORD, E.
PURE CHEMICALS
For TEACHING, RESEARCH, and TECHNOLOGY.

Revised Price List.

NEW DOUBLE SURFACE CONDENSER.

AS DEVISED BY
SIR WILLIAM CROOKES.
Showing the Scintillations of Radium.
Price with powerful Lens, and contained in
neat Leather case, 15/- Post free anywhere.

The scintillations seen in this instrument are
from Pure Radium Bromide of the highest
known activity, and are brighter and more
plentiful than those produced from Pitch
blende or other bodies of low Radio Activity.

Dr See letter from PROF. Gotch on " The Spinthariscope and Retinal Excitability" (NATURE, June 22, 1905, page 174), setting

forth a valuable scientific application of the A.C.COSSOR LONDON instrument.

A. C. COSSOR,
54 FARRINGDON ROAD, LONDON, E.C.

Telephone, 10547 Central.
Gold Medal St. Louis Exhibition, 1904.
CHEMICALS
METALS

MINERALS
For Laboratory, Scientific, and all other

purposes.
RADIUM SALTS & RADIO-ACTIVE PREPARATIONS.
CALCIUM METAL, 1/6 oz.; 20/- lb.

Price List on Application. HARRINGTON BROS.,

Chemical Manufacturers and Dealers, 4 OLIVER'S YARD, CITY ROAD, LONDON, E.C.

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THE “IDEAL.” This is the best and cheapest Condenser on the market; all delicate parts are protected by outer jacket, and the water cannot overflow into the distillate. Made in two sizes, 6"

and 8", 4/6 and 5/6 each.

Ir Nature says :-“This is one of the most com. pact and efficient condensers which has come before our notice. We have tested it for condensing such volatile substances as ether, carbon disulphide, and acetone, and have found that even with rapid distillation the condensation is very complete. Generally speaking, in order to condense these substances satisfactorily, it is necessary to employ a very long condenser; of course, this means using a great amount of bench space. As the new condensers are used in a perpendicular posi. tion, the saving in space is very great."

SOLE MAKERSBREWSTER, SMITH & Co.,

6 CROSS STREET, FINSBURY PAVEMENT, LONDON, E.C. All kinds of Apparatus for Science Teaching.

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WITH ENHANCED STEREOSCOPIC EFFECT.

x6, £6 0 0.
*8, £6 10 o.)"

: FOR TOURISTS.

0 SPECIAL TYPES FOR NATURALISTS,

MARINE WORK, HUNTING, &c. Illustrated Catalogue,"In," Post Free on Application.

NATURE says:--" The firm of Leybold Nachfolger in Cologne has recently issued a very complete and interesting catalogue of physical apparatus and fittings sold by them. The book starts with a history of the instruments made in Cologne during the last century. In its second section we find an account of the construction and fittings of various chemical and physical institutions. After this follows the catalogue proper, filling some 800 large pages, profusely illustrated and admirably arranged. The book will be most useful to the teacher." (No. 1846, Vol. 71.)

CARL ZEISS,

JENA.

Branches : LONDON: 29 Margaret St., Regent Street, W. Berlin, Frankfort o/M, Hamburg, Vienna, St. Petersburg.

THE CATALOGUE WILL BE FORWARDED TO SCHOOLS

AND INSTITUTES ON APPLICATION.

LIQUID AIR AND LIQUID HYDROGEN.

Dr. HAMPSON'S AIR-LIQUEFIER is now made to a standard pattera, and numbers are in use in University Laboratories and elsewhere in various countries. The whole apparatus is neat and compact and its parts very easily moved ; the Liquefier, without stand, being a cylinder 17 inches high and 8 inches in diameter.

It begins to liquefy air in from 6 to 10 minutes after the admission of air at from 150 to 200 atmospheres pressure, making over a litre of liquid per hour.

It requires no auxiliary refrigerant and produces a perfectly clear liquid which requires no filtering

The operator has only one gauge to watch and one valve to control. HYDROGEN LIQUEFIER to the designs of Dr. MORRIS W TRAVERS for use in conjunction with Air Liquefier.

BEWARE OF DO YOU WISH

PEEBLE
| TO BE

DITATION
UP TO DATE
in Scientific Demonstrating?
If so, send for our full descriptive pamphler of

the Kersbaw. Patent Lantern (Stroud and Rendall's and Kershaw Patents), made of best seasoned mahogany, French polished, lined with asbestos and Russian iron. Fitted with two double achromatic objectives, go silvered_prism, complete with B.T. or mixed jer, in travelling case, measuring

23" X 16" x 9".
ALL ACCESSORIES SUPPLIED. ARC LAMPS, RESISTANCES,

STANDS, &c
SOLE A. KERSHAW, Dorrington St., Leeds.
MAKER

CONTRACTOR TO H.M's GOVERNMENT.

[graphic]

For Prices and Particulars apply to the Sole Makers :BRIN'S OXYGEN COMPANY, LIMITED,

ELVERTON STREET, WESTMINSTER, S.W.

LAW OF HELICAL SPRINGS

[graphic]

The apparatus figured is substantially as described in Pro.. Perry's “ Applied Mechanics," and demonstrates the approximate truth of the following proposition :- If a given force be applied to deform a given length of wire, the point of application of the force suffers the same linear displacement, whether the wire is straight and the force applied to produce torsion in it from one end, or whether the wire is coiled into a clo e helix and the force applied axially to produce extension from one end ; provided that the arm of the effective moment in ihe first case is equal to the mean radius of the helix in the second case.

Price £4 0 0
IMMEDIATE DELIVERY.

THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, LTD.,

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