« PreviousContinue »
MANUFACTURER of Patented Induction Coils, other Scientific Instruments and Engineering Appliances
to the government Departments. JOINTLESS SECTION COILS, my system of 1868, to order, 10 in. Coils
4000 obms R, very thick discharge. Primary Coils for 10 to 230 volts. COMMERCIAL SERIES OF COILS, as Fig., at about one balf of catalogue prices,
Maker and Designer of the following Coils :POLYTECHNIC, 29 in. spark. SPOTTISWOODE, 44 in. spark. THE SOUTH KENSINGTON COIL, 48 in. spark. Special Coils for
Wireless Telegraphy. NEW TRIPLB-POLE MERCURY BREAK, giving a stream-like effect
when used with Apps' Patented Induction Coil (this can be fitted to
any Induction Coil), £6 6s. HOSPITAL X-RAY SETS, complete in every detail, from £25 each. The Model Apparatus adopted for South Africa, with Batteries, small
Steam Motor, &c. SETS OF X-RAY APPARATUS suitable for
Field Hospitals, from £50.
PRICES per return post.
A MAGAZINE TO AID TECHNICAL PROGRESS.
ILLUSTRATED. DECEMBER. NINEPENCE NET. PROGRESS OF SCIENCE AND TECHNOLOGY. THE DETERMINATION OF ATOMIC MASSES. By MORRIS W.
TRAVERS, D.Sc., F.R.S. SPECIAL DEVICES USED IN WEAVING. By Harry Nisbet. CAPTIVE BALLOON PHOTOGRAPHY. By GRIFFITH BREVER. A NOVEL TELEPHONE ACCESSORY. THE MECHANICS OF HEAVY ELECTRIC TRACTION. By H. F
PARSHALL, M.I.C.E., and H. M. HOBART, M.I.E.E. THE GEOMETRY OF THE SCREW PROPELLER. By WILLIAM J.
Goudie, B.Sc. THE ELEMENTS OF CHEMICAL ENGINEERING. By J. Gross
MANN, Ph.D., F.I.C. THE CALORIFIC VALUE OF CARBON. By HORACE ALLEN. A WEDGE FOR HAMMER AND TOOL HANDLES. ELECTRIC WAVES. By J. A. FLEMING, D.Sc., F.R.S. THE METALLOGRAPHY OF STEEL. By Percy LONGMUIR. THE ELECTRO-MAGNETIC THEORY. Explained without the use
of the Higher Mathematics. By Edwin EDSER, A.R.C.Sc. THE WATERPROOFING OF FABRICS. By H. HIELD. A GASOLINE INCANDESCENT LAMP. THE FIBROUS CONSTITUENTS OF PAPER. By CLAYTON BEADLE.
Illustrated from Photomicrographs by JOHN CHRISTIE, F.R.M.S.,
and Diagrams by the Author. PETROL ELECTRIC SELF-PROPELLED RAILWAY COACHES. THE INTERNATIONAL BUREAU OF METRIC STANDARDS. By
Jacques Boy R. MACHINERY IN A MODERN COTTON MILL. By W. Scott
TAGGART, M.I.M.E. THEORY OF STRUCTURAL DESIGN. Part XII. By E. FIANDER
GEORGE NEWNES, LIMITED,
MARCONI'S WIRELESS TELEGRAPH COMPANY,
BEWARE OF DO YOU WISH
the Kershaw. Patent Lantern
double achromatic objectives, 90° silvered prism, complete with B.T. or mixed jer, in travelling case, measuring
23" X 16" x 9".
CONTRACTOR TO H.Mi's GOVERNMENT. FLUORESCENT MINERAL TUBES, showing the beauriful effect produced by Willemite and other minerals, under the Cathode Rays.
15/- EACH. List of Minerals and colours produced on application. Also Pitchblende & Ravio-active
TAYLOR TAYLOR HOBSON.IT
8 TOUOHTO- STREET WOI LEICESTER
P. 1. Ben Den LODOR R
THE "ARISTON” GLEW'S SCINTILLOSCOPE
(PATENT). FINE ADJUSTMENT
Shows a magnificent display of scintillation,
showers of sparks, direct from the mineral Pitch (PATENT)
blende, Radium, Polonium, Uranium, Thorium, or any FOR MICROSCOPES
radio-active substance, even a Welsbach mantle con
tains sufficient Thorium to excite the very sensitive entirely eliminates the reflex action
screen of the Scintilloscope, which is far more sans
tive than the Spinthariscope. The Scintilloscope or side movement which occurs in
rivals the most delicate Electroscope as a detector most instruments when slight pressure SCREEN
of Alpha rays. is exerted in giving movement to the
The eye sees an inexhaustible shower of stars of
white light, giving a very realistic idea of the ceaseless
activity of these marvellous substances which are pro object. ducing the terrific bombardment causing this beautiful
I See NATURE, September 29, page 535.
Polonium Screens, giving brilliant effects, Complete, 7s.6d., Post free,
U.K. Foreign Postage extra, weight 2 ounces.
Screen attached, for use in Scintilloscope or with any strong pocket
Radio-active supplies of every description, on Sale or Hire. Radium 81 TOTTENHAM COURT ROAD, LONDON. Bromide, 1,800,000 units on hire for lectures.
F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900).
156 Clapham Road, London, S.W.
F. JERVIS-SMITH, M.A., F.R.S. consisting of 26 pages of articles by the best makers in the VARIOUS BRANCHES OF SCIENCE, Post Free to readers of NATURE.
2/- Post FREE. C. BAKER, 244 HICH HOLBORN, LONDON.
E. MOGRIDGE, 3 ST. GILES, OXFORD.
THE IRISH NATURALIST.
CATALOGUES Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD PRAEGER, B.A.
FREE. Annual Subscription, 58. Post Free to any Address. Dublin : EASON & SON, LTD., 40 Lower Sackville Street
ELECTRICAL TESTING INSTRUMENTS. (to which Address Subscriptions should be sent).
DURHAM HOUSE, North SIDE, London : SIMPKIN, MARSHALL, HAMILTON, KENT, & CO., Ltd. CLAPHAM COMMON, LONDON, S.W. MACMILLAN & CO.'S LIST.
VOLUME VII. NOW READY.
EDITED BY S. F. HARMER, Sc.D., F.R.S., AND A. E. SHIPLEY, M.A., F.R.S.
VOLUME VII. FISHES, &c.
ASCIDIANS AND AMPHIOXUS. By W. A. HERDMAN, D.Sc., F.R.S. SIR WILLIAM HENRY FLOWER, K.C.B., F.R.S., LL.D., D.C.L., late Director
of the Natural History Museum and President of the Royal Zoological Society. A Personal Memoir. By CHARLES J. CORNISH, M.A., F.Z.S. With Photogravure Portraits. 8vo. 8s. 6d. net.
TIMES.—“ The whole book is pleasantly written in a straightforward style. . . . Furnishes an acceptable memorial of : noble Englishman.”
NATURE. —" The author is to be decidedly congratulated on the attractive manner in which he has laid before the public the main features of a very interesting and highly successful scientific career.”
NEW VOLUME BY HENRY SIDGWICK. MISCELLANEOUS ESSAYS AND ADDRESSES. 8vo. IOS. net.
By H. S. HALL, M.A., and F. H. STEVENS, M.A. AN ELEMENTARY COURSE OF MATHEMATICS, comprising Arithmetic, Algebra, and Geometry. Globe 8vo.
AN INTRODUCTION TO THE CALCULUS. Based on Graphical Methods. Ву
GEORGE A. GIBSON, M. A., F.R.S.E., Professor of Mathematics in the Glasgow and West of Scotland Technical College. Crown 8vo. 35. 6d.
MACMILLAN AND CO., LIMITED, LONDON.
CABINETS AND APPARATUS
BRANCHES OF NATURAL HISTORY
Dr Our Catalogue (98 pp.) Post free on application
true to Nature.
(Five Doors from Charing Cross.) ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c.
COLLECTIONS IN POLISHED DEAL BOXES. 25 Specimens, 5/6; 50 do., 10/6; 100 dn., 21/-; 200 do., 42/
20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in
Geology, Physiography, and Mineralogy.
selection. Specimens sent on approval.
Boxes, Models of Crystals, &c., &c.
NEW CATALOGUE POST FREE THOMAS D. RUSSELL, 78 Newgate St., London, E.C.
MICROSCOPICAL PETROGRAPHY. Gentlemen interested in the above study are invited to send to
JAMES R. GREGORY & CO., 1 Kelso Place, Kensington Court, London, W.,
for a Prospectus of
Hall-Tone Plates, and also Four' actual Rock Sections. Subscription in advance, either Monthly, 7/-; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.
TO SCIENCE LECTURERS.
ALBERT EDWARD JAMRACH HUGHES' PHOTO • ROTOSCOPE CINEMATOGRAPHS.
(Late CHARLES JAMRACH), THE MOST PERFECT. No Flickering. Superb Mechanism.
NATURALIST, Price £7 7 0. The Moto-Photo Camera for taking the Pictures.
180 ST. GEORGE STREET EAST. Illustrated Lists, 2d.
Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery, See Mr. HUGHES PATENT COMBINATION OPTICAL LANTERN,
Netsukis China, Lacquers, Gongs, Shells, and other Curios. &c. Miniatore Triple Lantern constructed for B. J. MALDEN, Esq. ; great access. New Oxybydrogen Microscope. Science Lanterns for Class De: woestration. Magnińcent Results.. Docwra Triple, Prize Medals, Higbest
LIVING SPECIMENS FOR Award Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN Gorsness, &c. Patent Pampbengo Science Lanterns. The Universal
THE MICROSCOPE. Lasters 4-inch Condensers, 4-wick Lamp, Portrait Combination front Lenses, 18s. 68. Marvellous value. Science Lecture Sets. Novelties. Volvox, Spirogyra, Desmids, Diatoms, Amceba, Arcella, Actinosphærium, The Lantern Kaleidoscope. Cbeapest Lantern Outfits in the World, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many Grandly Wustrated Catalogue, over 180 choice Engravings, 6d.; other specimens of Pond Life. Price is. per Tube, Post Free. Helix Pantap, d. Small Illustrated Catalogue, 100 pages, free, sd. List of pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. $5,000 Ślides and 300 Lecture Sets, Science Subjects, Views, &c., 6d. ; Postage, zd. Pamphlets Preo. W. C. HUGHES, SPECIALIST,
THOMAS BOLTON, Brewster House, 82 Mortimer Road, Kingsland, N.
25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION
OF THE UNITED KINGDOM.
THE LABORATORY, PLYMOUTH. A List of this Series of Steel and The following animals can always be supplied, either living Photogravure Portraits of Men of or preserved by the best methods :
Sycon ; Clava, Obelia, Sertularia ; Actinia, Tealia, Caryopbyliia, A cy. Science will be sent post free to any
onium; Hormipbora (preserved); Leptoplana: Lineus, Ampbiporu, reader of "Nature" on application to Nereis, Aphrodite, Arenicola, Lanice, Terebella ; Lepas, Balanos the Publishers.
Gammarus, Ligia Mysis, Nebalia, Ca caus; Patella, Buccinum, Eledone, | Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinos.
Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c.
For prices and more detailed lists apply to
CHARGES FOR ADVERTISEMENTS. te s. d. TO ALL PLACES ABROAD:- & s. d.
6 s. d.
A s. d. Yearly.
2 6 Quarter Page, or Half
Per Line after
0 14 6
0 15 6 One Sixteenth Page,or Eighth Col. 10 Quarterly 0761 Quarterly o One Eighth Page, or Quarter
Half a Page, or a Column 3
0 18 6 Whole Page
OFFICE: ST. MARTIN'S STREET, LONDON, W.C,
5 0 0 6 0
Selenium Cells TOWNSON & MERCER
ESTABLISHED 1798 (OVER A CENTURY).
Scientific Apparatus Manufacturers and Laboratory
The cheapest, most accurate and most convenient Calorimeter on the market. Can now be seen on our stand, No. 127, at the International Gas
Exhibition. AND APPARATUS FOR DEMONSTRATING THE
Price complete, ACTION OF LIGHT ON
£10:18:6 Nett. SELENIUM. ISENTHAL & co., TOWNSON & MERCER, 85 MORTIMER STREET, LONDON, W.
34 CAMOMILE STREET, E.C. Contractors to the Admiralty, War, India, and Colonial Offices, &c.
THE STEREOSCOPIC COMPANY'S
C. E. MÜLLER, ORME & CO., ARTIST'S
LTD. CONTRACTORS TO HIS MAJESTY'S GOVERNMENT,
148 HIGH HOLBORN,
MANUFACTURERS OF APPARATUS FOR TEACHING
The finest possible instrument for all practical purposes, embodying every scientific requirement.
MECHANICS, HYDROSTATICS, &C.
DEALERS IN PURE AND COMMERCIAL CHEMICALS.
The Ideal Camera for BIRD PHOTOGRAPHY, NATURAL STUDENTS' SETS OF APPARATUS.
HISTORY SUBJECTS, PORTRAIT AND FIGURE
STUDIES, ARCHITECTURAL & GENERAL WORK. LISTS : - Chemical Apparatus-Chemicals-Balances-Assay- Write for full particulars from .
Thermometers-Electrical Apparatus-Focus Tubes, X-Ray, THE LONDON STEREOSCOPIC COMPANY, and Wireless Telegraphy Apparatus-or SPECIAL WHOLE- 106 & 108 REGENT ST., W., or 54 CHEAPSIDE, E.C. SALE (for Quantities)—free on application.
ESTABLISHED OVER 60 YEARS. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City o London, and published by AI ALAILLAX
AND Co., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 16 Fifth Avenue, New York.- THURS.JAY, Dec. 15, 1984
No. 1834, VOL. 71] THURSDAY, DECEMBER 22, 1904. [PRICE 15 CENTS,
(All Rights are Reserved.
REYNOLDS & BRANSON, Ltd.
Chemical and Scientific Instrument Makers to His Majesty's
Government (Indian, Home, and Colonial).
LABORATORY FURNISHERS and MANUFACTURING CHEMISTS. " DEMONSTRATOR'S” LANTERN. FOR LIMELICHT OR ELECTRIC.
The most simple With Prism for Erecting,
and efficient and for Vertical Projection,
Single Lantern Price £10 10s.
for general 3 FLEET ST.,
scientific work. LONDON
CHEMICAL AND PHYSICAL BENCH, illustrated above, as suppliep
Illustrations, free on application.
14 COMMEROIAL STREET, LEEDS.
THE NEW BOOK
NEGRETTI & ZAMBRA'S
PRICE ONE SHILLING.
Contalning an original description of the prirciples and function of the photographic lens. Together with the
latest workshop methods. Then there follows a series of chapters on practical photography and the effect of lenses on results. The chief types are discussed and compared by means of original diagrams. Also an appendix on the Gauss Theory and on a new system of lens testing. The book
A SIMPLE TREATISE,"
POST FREE 1/3
EDITION DE LUXE, 3/6 POST FREE.
THE NEW PATTERN COMBINED BARO-THERMOGRAPH. The above instrument combines in one apparatus the Recording Baro. meter and Recording Thermometer, giving thus on one and the same chart continuous records of the atmospheric pressure and temperature for seven days.
VERY SUITABLE FOR A CHRISTMAS PRESENT.
Presents, Post Free to all parts of the World.