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THE ROYAL INSTITUTE OF PUBLIC
PUBLIC HEALTH LABORATORIES.
1. DEMONSTRATOR OF BACTERIOLOGY.
2. DEMONSTRATOR OF CHEMISTRY. Further particulars to be obtained of the SecrETARY, 19 Bloomsbury Square, W.C.
BAUSCH & LOMB'S CENTRIFUGES
CITY OF BIRMINGHAM EDUCATION
COMMITTEE. The Committee requires the services of an ASSISTANT MISTRESS as a Peripatetic Teacher of Science. Salary, 6100 to £130 per annum, according to qualifications and experience. Candidates should be qualified in Hygiene and Laws of Health. Form of application may be obtained from the undersigned.
JNO. ARTHUR PALMER, Secretary. Education Department, Edmund Street, November 7, 1904.
As supplied to H.M. War Department & the Medical Profession
TWO SPEED CENTRIFUGE, complete with Haematokrit, Uribe and Sputum Sedimentation
complete with Urine Sedimentation Attachmen,
£2 0 0.
Write for Illustrated Microscopical Catalogue, 3 Stamps to cover postage. Also Lists of Microtomes, Centrifuges. Photographic Shutters, ad
Lenses of all descriptions, to A. E. STALEY & CO., 19 THAVIES INN, HOLBORN CIRCUS,
BEDFORD COLLEGE FOR WOMEN.
(UNIVI RSITY OF LONDON.)
YORK PLACE, BAKER STREET, W.
Applications must be sent by November 25 to the SECRETARY of the
H. WALTON, Secretary.
OLDBURY SECONDARY SCHOOL AND
PUPIL TEACHERS' CENTRE. The Governors require, after Christmas, an ASSISTANT MASTER to teach ordinary Form Subjects and Science or Mathematics. Salary, 6120 per annum.
Further particulars may be obtained from the SECRETARY, to whom applications should be forwarded on or before November 26, 1904.
H. A. ANDERSON, Secretary. Technical Schools, Oldbury.
UNIVERSITY COLLEGE OF WALES,
T. MORTIMER GREEN, Registrar.
APPLICATIONS to fill a vacancy at present
existing are invi'ed from thoroughly competent yourg men, experienced in the various departments of a wh lesale house, and with pharma. ceutical qualifications. Essential requirements are-First rate bu-iness abilities. Te ou ce, initiative enerzy, power of organisation and leen commercial instincts. A progressive position for a clever and energetic
dinini.trator, capable of assuming control of a complete staff. Personal i ter jewecessary. Full articulars of experience age, and saları r quireil in 'DE X.1," West Enl Advertising Agency, Lid., 19; Oxford Street, W.
Fim" to 50"
OWEN'S SCHOOL, ISLINGTON. WINTED in January, PHYSICS MASTER and CHEMISTRY MASTER. Must have had experience in good laboratories, and be able to lecture and illustrate by experiments in an efficient manner.
HARRY W C0.X LTD Two Science Masters on each side. Cominencing salary, £150. Apply at once, giving age, qualification, experience, and copies of ihree recent testimonials, to the HEAD MASIER. Substantial English Company desires to
COX'S INDUCTION COILS extend its business by acquiring the British and Colonial rights of a We have now added a Special Department for the new Chemical Product which is likely to be used on a very large scale for Industrial purposes. Advertisers have exceptional facilities
manufacture of for expoluiting an invention of this kind. Offers, with full particulars,
ACCUMULATORS, to be sent to B 101, 1. B. Browne's. Advertising Offices, 163 Queen cnabling us to produce same at first cost combined vi tot a Street, E.C.
with large output and great durability.
NEW ILLUSTRATED CATALOGUE Required by Manufacturer of Scientific
(including Instructions to Beginners) Post Free. Intiments, a Assistant, to take charge of adjustment of highly 2 curale Resistar.ce Coils. One having technical training preserred
HARRY W. COX, Ltd., Actual Manufacturers. Bux 28, c/o Nature.
FACTORY AND OFFICES:
la ROSEBERY AVENUE, & 15-21 LAYSTALL ST., LONDON, E.C. For other Scholastic divertisements, see page x.
(Removed from Cursitor Street.)
Radium Clocks. RADIUM
2,000,000 Unit Strength.
AVING made a special study of these
instruments, we are in a position to
2 tubes of 5 mgs. each and 1 tube of 24 mgs. 1. For the Lecture
A new radio-active substance from 2. For Lantern Slide
Pitchblende. It gives large and more
effective sparks on a phosphorescent Price, according to quantity
screen than Radium or Polonium, and of Radium, will be quoted is considered better for the Spinby return post.
thariscope. We make a special feature of CHEMICALS
A few decigramme tubes for sale at
30/- the decigramme. AND APPARATUS of all kinds.
PRICE LIST FREE.
Sample Bottle 1/6 Post Free.
ARMBRECHT, NELSON & CO.,
(PATENT). NEW REVERSING POCKET VOLTMETER
Shows a magnificent display of scintillations, With Patent Shunt.
showers of sparks, direct from the mineral PitchELECTRIC MOTOR
blende, Radium, Polonium, Uranium, Thorium, or any radio-active substance, even a Welsbach mantle con
tains sufficient Thorium to excite the very sensitive as well with current of 8 volts only.
screen of the Scintilloscope, which is far more sensi. tive than the Spinthariscope. The Scintilloscope rivals the most delicate Electroscope as a detector of Alpha rays.
The eye sees an inexhaustible shower of stars of PITCH BLENDE white light, giving a very realistic idea of the ceaseless
activity of these marvellous substances which are producing the terrific bombardment causing this beautiful display.
See NATURE, September 29, page 535.
Polonium Screens, giving brilliant effects, Complete, 75. 6d., Post free,
U.K. Foreign Postage extra, weight 2 ounces.
Pieces of Pitchblende mineral, ground flat and polished, with Sensitive PRICE 36/
Screen attached, for use in Scintilloscope or with any strong pocket Ir Hustrated Electrical List Post Free.
magnifier, from 75. 6d. each, according to size.
Radio-active supplies of every description, on Sale or Hire. Radium F. DARTON & CO., Clerkenwell Optical Works,
Bromide, 1,800,000 units on hire for lectures.
F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900), 142 ST. JOHN STREET, LONDON, E.C.
156 Clapham Road, London, S.W.
(CONSTANT DEVIATION). The special advantages of this Spectroscope are—the Collimator and Telescope are fixed at right angles, thus the instrument will stand in a corner, and is always ready for use and in adjustment.
The Prism is of special form and automatically sets itself at minimum deviation,
READS IN WAVE-LENGTHS DIRECT & WITH CREAT ACCURACY. Descriptive Pamphlet of this Spectroscope Post Free on application.
GOLD MEDAL AWARDED, ST. LOUIS EXHIBITION, 1904. ADAM HILGER, Ltd., 75a Camden Road, London, N.W.
Apparatus or estimation of sulphur in spent oxide.
Importers, Manufacturers, and Dealers in
Plain and Stoppered Bottles, AND EVERY LABORATORY REQUIREMENT. Illustrated Catalogue of Apparatus, with Price
List of Chemicals, free on application. Telegraphic Address—"APPARATUS, MANCHESTER."
TO SCIENCE LECTURERS. HUGHES' PHOTO • ROTOSCOPE CINEMATOGRAPHS.
THE MOST PERFECT. No Flickering. Superb Mechanism. Price £7 7 0. The Moto-Photo Camera for taking the Pictures.
Illustrated Lists, 2d. See Mr. HUGHES' PATENT COMBINATION OPTICAL LANTERN, &c. Miniature Triple Lantern constructed for B. J. MALDEN, Esq. ; grea: success. New Oxyhydrogen Microscope. Science Lanterns for Class D.. monstration. Magnificent Results. Docwra Triple, Prize Medals, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATIAN GUINNESS, &c. Patent Pamphengo Science Lanterns. The Universal Lintern 4-inch Condensers, 4-wick Lamp, Portrait Combination front Lenses, 185. 6d. Marvellous value. Science Lecture Sets. Novelties. The Lantern Kaleidoscope. Cheapest Lantern Outfits in the World. Grandly Illustrated Catalogue, over 180 choice Engravings, 6d. Postage, 4d. Small Illustrated Catalogue, 100 pages, free, 5d. List of 60,000 Slides and 300 Lecture Sets, Science Subjects, Views, &c., 6d.; Postage, 2d. Pamphlets Free. W. C. HUGHES, SPECIALIST, Brewster House, 82 Mortimer Road, Kingsland, N.
EXTREMELY MODERATE PRICES.
Institutions, Polytechnics, &c. NATURB says: “Teachers requiring efficient apparatos at a low cost for lecture or laboratory purposes, might consult the list witb advantage.''
List or application by mentioning NATURE. DRAWING INSTRUMENTS.
Best Make and Finish.
Obtained through any Optician. ROBERT NICHOLL, 153 HIGH HOLBORN, LONDON.
ARGON and HELIUM.
showing true spectrum. MANUFACTURED ON THE PREMISES.
Price 15s. each.
Argon or Helium, 258. each.
Awarded Gold Medal at St. Louis Exhibition A. C. COSSOR, 54 Farringdon Road, E.C. THE "SIRIUS” WATER-COOLING AND RECULATING TUBE.
of all kinds of
A List of this Series of Steel and Photogravure Portraits of Men of Science will be sent post free
any reader of “Nature"
application to the Publishers.
ST. MARTIN'S STREET, LONDON, W.C.
W. G. PYE & CO.. ,
Prices and further particulars upon application. SUBSTANTIAL APPARATUS FOR TEACHING AND RESEARCH
HIBBERT'S PATENT MAGNETIC BALANCES, STANDARD Sole
MAGNETS AND BALLISTIC GALVANOMETERS.
MURRAY'S PATENT ANGLEMETER.
RADIUM IN 5 Mgr. TUBES FOR SALE OR ON HIRE.
MR. EDWARD ARNOLD'S NEW BOOKS.
. THE CHEMICAL SYNTHESIS
OF VITAL PRODUCTS
By R. MELDOLA, F.R.S., Y.P.C.S., F.I.C., &c.,
Technical College, Finsbury.
Super Royal 8vo.
By the Hon. R. J. STRUTT,
Fellow of Trinity College, Cambridge. Demy 8vo.
With Diagrams. 8s. 6. net.
AN INTRODUCTION TO
Demy 8vo. With numerous Diagrams. 155. net.
By A. C. FORBES,
With Illustrations. 128. 6d. net.
By HENRI MOISSAN,
THE NEW "STUDENT'S"
(Rd. No. 420,297.)
It appeals especially to Colleges and Schools for Demonstration purposes,
The construction is on that of the well-known" Fortin" principle. The level of the cistern mercury is reducible to zero, in exactly the same manner as in the more expensive forms.
The diameter of the mercurial column is '25 inch, and affords a bold, well-defined reading. The scales, by means of the double vernier, are capable of being read to 'on inch and 1 millimetre. It is mounted on a wellpolished, solid mahogany board, with plates for attachment to wall, opal glass reflectors for reading off, and screws for vertical adjustment.
The metal portions are all well bronzed and lacquered, and the scales are silvered brass.
We confidently recommend this Instrument for use as a "Standard in Colleges and Schools, private Observatories, and by Gas and other Engineers. Price, complete, mounted as illustrated,
£3 7 6 each, or may be had with one scale (either inches or millimetres), and with thermometer on other scale, at same price.
I NATURE says :-“Provides an accurate instroment at a moderate cost."
FULL SIZE STANDARD BAROMETER of same design, bore oʻs" diameter, inches and millimetre scales, verniers reading to o'002 inch and oʻ1 mm, ou polished mahogany board with brackets and opal glass reflectors, £7 10 0 Sole Manufacturers and Proprietors of the
Registered Design. PASTORELLI & RAPKIN, LTD.
46 HATTON GARDEN, LONDON, E.C. WHOLESALE MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS.
Contractors to H.M. Government. Estd. 1750. Telegrams," Rapkin, London." Telephone, 1981 Holborn
SCHLEUSSNER'S SPECIAL RAPID PLATES
EXTREMELY RAPID WORK.
C. GRIFFIN & CO.'S MINING BOOKS.
A TREATISE ON MINE SURVEYING.
By BENNETT H. BROUGH, F.G.S., A.R.S.M.
(For observatories and scientific work generally) In Crown 8vo, with nearly 300 Illustrations. 75. 6d. net.
ARE THE BEST OBTAINABLE FOR
By Sir C. LE NEVE FOSTER, D.Sc., F.R.S.
PROJECTILES HAVE BEEN TAKEN ON THESE In Crown 8vo. Handsome Cloth. 200 Illustrations. 38. 6d.
PLATES WITH AN EXPOSURE OF
By GEORGE L. KERR, M.E., M.Inst. M.E.
Will be of great use to all who are in any way interested in coal mining." --Scottish Critic. THIRD Edition. With Plates and Illustrations. Cloth. 78. 6d.
The following is one of the many testimonials to the value of
these Plates for scientific work:THE CYANIDE PROCESS OF COLD EXTRACTION.
*JENA. A TEXT BOOK FOR THE USE OF METALLURGISTS
“It will perhaps not be without interest to you to hear of the efficiency AND STUDENTS AT SCHOOLS OF MINES.
of your plaies under exceptionally difficult circumstances. With your By JAMES PARK, F.G.S., M.Inst M.M.
plates I have taken instantaneous photographs of projectiles moving at a "We can confidently recommend this book as a thoroughly practical velocity as high as 900 metres per second. I think that the pictures pubwork, and congratulate the author on its continued success."-Chem. News. lished in the transactions of the Royal Academy, Vienna (Paper on
Experiments with Projectiles, Math. Nat. Class, Vol. CV. Div. IIa.) will In Pocket Size Leather, with Detachable Blank Pages for MS. Notes. 35. 6d. furi.ish the most striking te-timonial of the value of your article. In the THE MINING ENGINEERS' REPORT BOOK, above paper and also in the "Süddeutsch. Photogr. Zeitung," I have given AND DIRECTORS' AND SHAREHOLDERS' GUIDE TO
full particulars of the efficiency of your plates. Although the exposure MINING REPORTS.
was only 1/100,oootb of a second, the pictures are wonderfully sharp and
clean, and exbibit a grain resembling that of collodion plates, wbich latter By EDWIN R. FIELD, M.Inst. M.M. “An admirably compiled book which mining engineers and managers
property renders the plates specially suitable for stellar photography.
"Yours respectfully, will find extremely useful."- Mining Journal.
sig. Dr. Ludwig Mach." With Numerous Plates, Maps, and Illustrations. 218. net. CYANIDING GOLD AND SILVER ORES. These Plates may be obtained from Photographic Dealers, or By H. FORBES JULIAN & EDGAR SMART, A.M.I.C.E.
from the Sole Agents for Great Britain :"A handsome volume of 400 pages, which will be a valuable book of reference for all associated with the process." -Mining Journal.
THOMAS CHRISTY & CO., LONDON : CHARLES GRIFFIN & CO., LTD., EXETER STREET, STRAND.
4, 10 & 12 OLD SWAN LANE, LONDON, E.C.