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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.
HIGH FREQUENCY APPARATUS of my newest models.

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

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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

ETCHELLS, A.M.I.M.E.
REVIEWS. ANSWERS TO QUERIES (Illustrated) -COMPETI-
TIONS.-PERSONAL ITEMS.

GEORGE NEWNES, LIMITED,
3-12 SOUTHAMPTON STREET, STRAND, LONDON.

£8.

MARCONI'S WIRELESS TELEGRAPH COMPANY,

LTD,

Manufacturers of

two

ELECTRICAL INSTRUMENTS

BEWARE OF DO YOU WISH

FEEBLE
TO BE

IMITATIONS
UP TO DATE
in Scientific Demonstrating?
If so, send for our full descriptive pamphle: 01

the Kershaw. Patent Lantern
(Stroud and Rendall's and
Kershaw Patents), made of
best seasoned mabogany.
French polished, lined wiih
asbestos and Russian iron.
Fitted with

double achromatic objectives, 90° silvered prism, complete with B.T. or mixed jer, in travelling case, measuring

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

STANDS, &c.
SOLER A. KERSHAW, Dorrington St., Leeds.

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

Salts.
A. C. COSSOR, 54 Farringdon Road, London, E.C.
AWARDED GOLD MEDAL, ST. LOUIS EXHIBITION, 1904.

Telephone-10547 Central.
For Photography, Unsurpassed for fine definition.

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COOKE LENSES

ALSO AT

TAYLOR TAYLOR HOBSON.IT

BRUSSELS, PARIS,

PARIS, ROME,

8 TOUOHTO- STREET WOI LEICESTER

P. 1. Ben Den LODOR R

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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

PITCH BLENDTE
Micrometer screw when focussing an

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

display.

I See NATURE, September 29, page 535.
De Sec Commendatory Notice in NATURE, Glew's Scintilloscope Superior Lens, with Extra-sensitive Pitchblende and
November 6, 1902, page 15.

Polonium Screens, giving brilliant effects, Complete, 7s.6d., Post free,
LISTS POST FREE.

U.K. Foreign Postage extra, weight 2 ounces.
Pieces of Pitchblende mineral, ground flat and polished, with Sensitive

Screen attached, for use in Scintilloscope or with any strong pocket
JAMES SWIFT & SON, magnifier, from 75. 6d. each, according to size.

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).
FOR SALE.

156 Clapham Road, London, S.W.
EVERSHED'S SOLAR SPECTROSCOPE, HIEĞER.
Designed for observing Solar Prominences, with Solar Reversing
Prism in Rotating Mounts, 2 Slits, Mounted in Aluminium, in Case,

BY
£25, cost over £50.
The October Issue of our List of SECOND-HAND INSTRUMENTS,

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.

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THE TRAM-CHRONOGRAPH.

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THE IRISH NATURALIST.
A Monthly Magazine of Irish Zoology, Botany, and
Geology. Price 6d.

MANUFACTURERS

CATALOGUES Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD PRAEGER, B.A.

OF

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ELECTRICAL TESTING INSTRUMENTS. (to which Address Subscriptions should be sent).

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VOLUME VII. NOW READY.
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VOLUME VII. FISHES, &c.
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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.”

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25. 6d.

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.

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CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

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SPECIAL SHOW-ROOM FOR CABINETS.

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MICROSCOPICAL PETROGRAPHY. Gentlemen interested in the above study are invited to send to

JAMES R. GREGORY & CO., 1 Kelso Place, Kensington Court, London, W.,

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ALBERT EDWARD JAMRACH HUGHES' PHOTO • ROTOSCOPE CINEMATOGRAPHS.

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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,

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Selenium Cells TOWNSON & MERCER

ESTABLISHED 1798 (OVER A CENTURY).
RETAIL —89 BISHOPSGATE STREET WITHIN, E.C. WHOLESALE – 34 CAMOMILE STREET, EL

Scientific Apparatus Manufacturers and Laboratory
Outfitters to the Home and Colonial Departments of
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And the various Industries throughout the World.

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The cheapest, most accurate and most convenient Calorimeter on the market. Can now be seen on our stand, No. 127, at the International Gas

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MANUFACTURERS OF APPARATUS FOR TEACHING

The finest possible instrument for all practical purposes, embodying every scientific requirement.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye."—WORDS WORTH.

No. 1834, VOL. 71] THURSDAY, DECEMBER 22, 1904. [PRICE 15 CENTS,
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.
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CHEMICAL AND PHYSICAL BENCH, illustrated above, as suppliep
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Catalogue of Chemical and Physical Apparatus, 350 op. and 1200

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Contalning an original description of the prirciples and function of the photographic lens. Together with the

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