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LIQUID AIR and LIQUID HYDROGEN.

AND

Transparent Fused Quartz

Dr. HAMPSON'S AIR-LIQUEFIER is now made to a standard pattern, 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 LIQUEFIĚR to the designs of Dr. MORRIS W.
TRAVERS for use in conjunction with Air-Liquefier.
For prices and particulars of the above and commercial
apparatus of the same description manufactured under

the Lindo and Hampson patents apply to
THE BRITISH OXYGEN CO., Ltd.,

(Formerly Brin's Oxygen Co., Ltd.) ELVERTON STREET, WESTMINSTER, S.W.

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This is a photograph of an “ Assay Set” made from quartz rod and tube, a copy of a platinum model, and holds thirteen prill cups. The price of this set is 38/6.

We supply other sizes at proportionate prices. Such a piece of apparatus of ordinary glass would be useless, but made of quartz glass is an excellent example of the uses of what has been termed "poor man's platinum."

Ulustrated Price List and Sample of Tube free

on application to THE SILICA SYNDICATE, Ltd.,

82 HATTON GARDEN, LONDON.

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DARTON'S IMPROVED SELF-RECORDING BAROGRAPH recording on a Chart the rise and fall of the Barometer. In Polished Mahogany Case with Handle, £4 10 0

SELF-RECORDING THERMOGRAPH, for accurately recording variations in temperature.

In Stout Metal Case with Handle, £4 10 0 i New Illustrated List of Standard Meteorological Instruments,

post free. F. DARTON & Co., 142 St. JOHN STREET, LONDON, E.C.

INDUCTIVE TELEGRAPHY

SHARMAN'S

INDISPENSABLE TO PATENT APPARATUS

LECTURERS

AND STUDENTS. Enables one to actually send and receive Messages

THE ONLY COMPLETE in the Morse Code.

MODEL WIRELESS TELEGRAPH

APPARATUS. Price complete (2 Instruments 86 10s.

It can be worked

from room to room, r Illustrated Descriptive

or house to house,
Booklet, gratis on application to-
TELECRAPH & TELEPHONE INSTRUMENTS, LTD., 25 VICTORIA STREET, LONDON, S.W.
Telephone : 5712 Westminster.

Telegrams: “CYMOZIA, LONDON."

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MAX

KOHL, LTD.

Chemnitz, Germany,

MANUFACTURERS OF
PHYSICAL, CHEMICAL, AND PRECISION MECHANICAL

INSTRUMENTS AND APPARATUS,
THE LARGEST ESTABLISHMENT OF ITS KIND.

IND.
Furnish as a Speciality

Apparatus after Tesla, Hertz, Marconi, &c. COMPLETE OUTFITS

Complete Outfits for X-Ray Work.

Purest Radium Bromide of 1,200,000 ~ activity. FOR LABORATORIES. Apparatus for Phototelegraphy.

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NOVELTY
INDUCTION

COILS
For quick and

distant Radiographies.

NEW MEGA
DIASCOPE!
Most perfect

Projection

Apparatus. OIL AIR PUMP

FOR HIGH VACUA, patented in

Germany, England, America

NEW
HIGH TENSION
RECTIFIER.

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All apparatus described in" An Introduction to Electricity," by Bruno Kolbe, published by Kegan Paul, Trench, Trübner and Co., Ltd.,

London, 43 Gerrard Street, Sono. SPECIALITY: Acoustical Apparatus, such as pipes, tuning forks, syrens, and all other high precision instruments of this kind which were formerly supplied by Rud. Koenig, Paris, and Appunn, Hanau.

*One of our college customers in the U.S.A. writes: "I am glad to be able to inform you that the tuning forks which you supplied for the Department of Psychology compare very favourably with ones previously obtained from Landry and Koenig and are possibly superior." 1 Profusely Illustrated Catalogues with 3500 Ilustrations, directions, quotations, references, &c., in English,

French and German, supplied without any charge to Colleges, Universities and Physicians. World's Fair, St. Louis, 1904, Grand Prize and Gold Medal. World's Fair, Chicago, 1893, 2 Diplomas; World's Fair, Paris, 1900.

MAGNALIUM BALANCES

FOR LABORATORY AND STUDENTS' USE.

T

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No. 10 N. Solid Beam.

No. 10 R. Open Beam. FIRST AND ONLY MACNALIUM BALANCE IN EXISTENCE. MOST SUITABLE AND SPECIALLY RECOMMENDED FOR STUDENTS' USE,

ADVANTAGES OVER THE ORDINARY BRASS BALANCE :Lighter and stronger, always clean and bright, never rusty. Also preferable for use in Laboratories,

the Magnalium not being affected by fumes and gases. OBTAINABLE FROM ALL WHOLESALE CHEMICAL AND SCIENTIFIC APPARATUS DEALERS,

to whom application should be made for Samples, Prices, and Full Particulars.

W. G. PYE & CO.,

Scientific Instrument Makers, GRANTA WORKS, CAMBRIDGE,

ENGLAND

MODELS.
Plants & Parts of Plants.

JURASSIC DINOSAURS.

MODELS.

MODELS.
Palæozoic Fructifications.

MADE BY
H. E. H. SMEDLEY,

Elected F.L.S., 1899; F.G.S., 1901.
Late Lecturer in Botany at Walthamstow Technical
Institute, and Hon. Curator Tottenham Museum ;
Modeller of Palæozoic Fructifications to his
Majesty's Government, the Universities and
Public Schools ; Awarded Diploma for
Gold Medal at the Franco British

Exhibition, 1908.
17 BARRY ROAD,
East Dulwich.

LONDON, S.E.
Send for Catalogue.
SOLE AGENTS:

Messrs. GALLENKAMP & CO.,
19 & 21 SUN STREET, FINSBURY, E.C.

LONDON,
See highly favourable review, NATURE, Feb. 28, 1907, page 413.
THE TECHNICAL COLLEGE SET.

CONTENTS,
(All our best

Electrum) 4-inch Bow Pencil Compass, with knee joints and nut and bolt needle point, ink point and length ening bar; 5-inch Improved Pat. tern Hair Divi.

der ; Ink, Pencil, Xem and Divider

Spring Bows; 2 Drawing

Pens;

Pricker ; Box of Price complete, 42/- in Mahogany with Tray, or Compass Leads

Leather covered Pocket Case. spare Needles. W. H. HARLING, Mathematical Drawing andreSurveying

Instrument Manufacturer, 47 FINSBURY PAVEMENT, LONDON, E.C.; AND AT CROSVENOR WORKS, HACKNEY. Established 1851. Illd. Catalogue (covering all kinds) Post Free.

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RADIUM

OF MAXIMUM ACTIVITY ONLY

FROM STOCK.
Price (moderate)

application. ALSO PURE CHEMICALS AND APPARATUS FOR LABORATORY USE.

on

WM. MARTINDALE, MANUFACTURING 10 NEW CAVENDISH STREET, LONDON, W.

Telephones : 4688 GERRARD and 1797 PADDINGTON.

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"

CUSSONS PATENT

THE BUSCH TERLUX BINOCULAR RIBBON ATWOOD MACHINE. Finest Class for Nature Study.

is without doubt the

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a

This machine is

proving a very efficient Instrument, and is

superseding the old forms of Atwood.

It is extremely accurate, well made, and simple in action.

Many excellent reports have been
received from Colleges, Public Schools
and Secondary Schools to its
efficiency.

The Experimental Tests of our 12
last machines give a value for g vary-
ing between 31.6 and 32:06 ft. per sec.
per sec.
It is easily fixed and easily worked.
Complete with all Accessories,

£6 : 0 : 0
Packed.

Carriage Paid.

The illumination is much greater

than other Prism Glasses and sufficient to

secure bright image in wood and forest, in the early morning or the evening as well as in

the open brilliant light of mid-day.

as

Of all
Up-to-date"
Opticians.

G. CUSSONS, LTD.,
THE TECHNICAL WORKS, MANCHESTER ; and
THANET HOUSE, 231 STRAND, LONDON, W.C.

(Opposite the Law Courts.)

LISTS FROM :

Emil Busch Optical Co., 35 CHARLES STREET, HATTON CARDEN, LONDON, E.C.

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