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STRAND, LONDON.

433 MANUFACTURER of Patented Induction Coils, other Scientific Instruments and Engineering Appliances

to the Government Departments. JOINTLESS SECTION COILS, my system of 1868, to order, ro in. Coils

4000 obms R, very thick discharge. Primary Coils for 10 to 230 volts. COMMERCIAL SERIES OF COILS, as Fig., at about one-ball of cata. logue 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 TRIPLE-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

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Field Hospitals, from £50.
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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 BREWER. 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.

Nlustrated 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 BOYBR. MACHINERY IN A MODERN COTTON MILL. By Wm. Scott

TAGGART, M.I.M.E. THEORY OF STRUCTURAL DESIGN. Part XII. By E. FIANDER

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

£8.

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ELECTRICAL INSTRUMENTS

BEWARE OF DO YOU WISH

FEEBLE 1 TO BE

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

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

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

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

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

CONTRACTOR TO H.M.'s GOVERNMENT. FLUORESCENT MINERAL TUBES, showing the beautiful effect produced by Willemite and other minerals, under the Cathode Rays.

15/- EACH. List of Minerals and colours produced on application. Also Pitchblende & Rauio-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 JENSES

ALSO AT

BRUSSELS, PARIS, ROME.

TAYLOR. TAYLOR: HOBSON.IS Srovo-tow Stout Worus LEICESTER

* • ..... on LOOO

THE "ARISTON”
FINE ADJUSTMENT

(PATENT)
FOR MICROSCOPES
entirely eliminates the reflex action
or side movement which occurs in
most instruments when slight pressure
is exerted in giving movement to the
Micrometer screw when focussing an

object.
D Sec Commendatory Notice in NATURE,

November 6, 1902, page 15.
LISTS POST FREE.

CINTILLOSCOPE

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SCREEN

GLEW'S SCINTILLOSCOPE

(PATENT). Shows a magnificent display of scintillations showers of sparks, direct from the mineral Pitch blende, Radium, Polonium, Uranium, Thorium, or asy radio-active substance, even a Welsbach mantle con tains sufficient Thorium to excite the very sensitive screen of the Scintilloscope, which is far more sens tive than the Spinthariscope. The Scintilloscope rivals the most delicate Electroscope as a detectar of Alpba 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 pro ducing the terrific bombardment causing this beautiful display.

See NATURE, September 29, page 535.
Glew's Scintilloscope Superior Lens, with Extra-sensitive Pitch blende and

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

Screen attached, for use in Scintilloscope or with any strong pocket

magnifier, from 75. 6d. each, according to size.
Radio-active supplies of every description, on Sale or Hire. Radium

Bromide, 1,800,000 units on hire for lectures.
F. HARRISON GLEW, Radiographer (Silver Medallist, Paris, 1900).

156 Clapham Road, London, S.W.

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JAMES SWIFT & SON,
81 TOTTENHAM COURT ROAD, LONDON.

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THE TRAM-CHRONOGRAPH.

BY

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THE IRISH NATURALIST.
A Monthly Magazine of Irish Zoology, Botany, and

Geology. Price 6d.
Edited by GEO. H. CARPENTER, B.Sc., and R. LLOYD

PRAEGER, B.A.
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MANUFACTURERS

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ELECTRICAL TESTING INSTRUMENTS.

DURHAM House, North SIDE, CLAPHAM COMMON, LONDON, S.W.

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VOLUME VII. NOW READY.
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TO BE COMPLETED IN TEN VOLUMES. Fully ILLUSTRATED. 8vo. Price 175. NET EACH.

VOLUME VII. FISHES, &c.
FISHES (exclusive of the Systematic Account of Teleostei). By T. W. BRIDGE, Sc.D., F.R.S. FISHES (Systematic
Account of Teleostei). By G. A. BOULENGER, F.R.S. HEMICHORDATA, By S. F. HARMER, Sc.D., F.R.S.

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

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TIMES.—“The whole book is pleasantly written in a straightforward style. . . . Furnishes an acceptable memorial of a noble Englishman."

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NEW VOLUME BY HENRY SIDGWICK. MISCELLANEOUS ESSAYS AND ADDRESSES. 8vo. Ios. net.

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25. 6d.

By H. S. HALL, M.A., and F. H. STEVENS, M.A. AN ELEMENTARY COURSE OF MATHEMATICS, comprising Arithmetic,

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PHENIX
ASSURANCE COMPANY, LIMITED.

FIRE OFFICE.
19 LOMBARD ST., E.C., and 57 CHARING CROSS, S.W.

ESTABLISHED 1782.
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LOSSBS PAID OVER 286,000,000.

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Selenium Cells TOWNSON & MERCER

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ESTABLISHED 1798 (OVER A CENTURY).
RETAIL

—89 BISHOPSGATE STREET WITHIN, E.C. WHOLESALE — 34 CAMOMILE STREET. EL
Scientific Apparatus Manufacturers and Laboratory
Outitters 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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CONTRACTORS TO HIS MAJESTY'S GOVERNMENT,

148 HIGH HOLBORN,

LONDON, W.C.

REFLEX

CAMERA.

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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."—WORDSWORTH.

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

(All Rights are Reserved.
REYNOLDS & BRANSON,

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Chemical and Scientific Instrument Makers to His Majesty's
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CHEMICAL AND PHYSICAL BENCH, illustrated above, as suppliep
to National Physical Laboratory, Teddington, fitted for Gas, Water

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Catalogue of Chemical and Physical Apparatus, 350 Dp. and 1200

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