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LIQUID AIR and LIQUID HYDROGEN.
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.
the Lindo and Hampson patents apply to
(Formerly Brin's Oxygen Co., Ltd.) ELVERTON STREET, WESTMINSTER, S.W.
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.
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.
INDISPENSABLE TO PATENT APPARATUS
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,
Telegrams: “CYMOZIA, LONDON."
INSTRUMENTS AND APPARATUS,
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.
Apparatus. OIL AIR PUMP
FOR HIGH VACUA, patented in
Germany, England, America
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.
FOR LABORATORY AND STUDENTS' USE.
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,
Elected F.L.S., 1899; F.G.S., 1901.
Messrs. GALLENKAMP & CO.,
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
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.
OF MAXIMUM ACTIVITY ONLY
application. ALSO PURE CHEMICALS AND APPARATUS FOR LABORATORY USE.
WM. MARTINDALE, MANUFACTURING 10 NEW CAVENDISH STREET, LONDON, W.
Telephones : 4688 GERRARD and 1797 PADDINGTON.
THE BUSCH TERLUX BINOCULAR RIBBON ATWOOD MACHINE. Finest Class for Nature Study.
is without doubt the
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
The Experimental Tests of our 12
£6 : 0 : 0
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.
G. CUSSONS, LTD.,
(Opposite the Law Courts.)
LISTS FROM :
Emil Busch Optical Co., 35 CHARLES STREET, HATTON CARDEN, LONDON, E.C.