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FORTIN'S STANDARD BAROMETER
Registered Design No. 470,297. As will be seen by the illustration, this Barometer is built on original lines.
By the absence of the ordinary tubular enclosures in the usual form of instrument) the mercurial column is FULLY EXPOSED to view, NO SHADOWS are thrown upon the column, and therefore an extremely accurate and instantaneous reading is made possible. The scales being graduated upon the flat side peces he DIVISIONS AND FIGURES ARE ALWAYS IN VIEW, and the vernier is very much more legible than in the ordinary tubular patterns.
The bore of the tube is 0.5 inch.
The scales are graduated in inches and millimetres, and, by means of the verniers, are capable of being sub-divided to read 10 0·002 inches and 0:1 m/m.
The attached Thermometer on the body of the instru. ment is graduated in Fahrenheit and Centigrade scales.
It is the BOLDEST Standard Barometer made.
The PRICE IS LOWER than that of any other form of Standard Baroineter of the same dimensions.
It yields readings equally close as the bighest priced instruments.
Price complete, mounted on handsome Polished Solid Mahogany Board, with Brackets for Suspension, and Opal Glass Reflectors,
£7 10s. Od. SMALLER SIZE, “THE STUDENTS," designed for Schools for demonstration work, and small private Ob-ervatories; bore 25 ; reading tu 01 inch
and 1 millimetre. 23 7s. 6d.
Results hitherto only pos. sible with mercury pumps are readily obtainable by the “ Geryk." Used by all leading scientists. Far more rapid than any other
vacuum pump. Price from Write for $4 : 5 : 0. LIST F.45. Pulsometer Engineering Como
Vine Elmoilronworks. Reading
Sole Manufacturers and Proprietors of the Regd. Design:
46 HATTON GARDEN, LONDON, E.C. WHOLESALE MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS
Telegrams: RAPKIN, LONDON.
Nat. TEL.: 1981 Holborn. Estd. 150 years. N.B.- If any difficulty be found in securing any of our Instru.
ments through your Dealer, kindly communicate with us.
Tank to take 6 plates 15" X 12", and with Adapters to suit
any smaller plate; complete, £1 : 10:0 This arrangement is specially recommended to Radiographers and other
Scientific Photograhers. Tank to hold 1 doz. $ plates only
... ... 4/6 each. Tank to hold 1 doz. 5" x 4" plates only ... ... 5/Tank to hold 1 doz. } plates only ... ... ... 6- ,,
Pustage on any of above three sizes, 4d. extra.
COMPLETE EQUIPMENTS CHEMICAL, BACTERIOLOGICAL,
PHYSICAL, and METALLURGICAL LABORATORIES. Sardinia Street, London, W.C.
NEW PHOTOGRAPHIC PRICE LIST, 25!h EDITION, ON
The wave-lengths can be read off by the observer without moving from his place.
The object glasses and prism are large (1}" clear aperture), which enables the saintest visible lines to be seen.
The eyepiece has a bright pointer for measuring the W.L. of bright lines on a dark field.
Means are supplied of very simply setting the Zero, although on account of the great rigidity and careful construction throughout it may be used for many months without any setting being needed.
ADAM HILGER, Ltd., 75a Camden Road, London, N.W.
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THE GAIFFE AUTO-MOTOR
MERCURY JET INTERRUPTER
(Patented in Britain). NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR.
The interruption cuts the current both for motor and coil. In other words, motor and interrupter are electrically and mechanically linked together.
1 See Nature, July 20, 1905. Fage 277. Price, including box and packing, £4 :6:6 THE MEDICAL SUPPLY
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