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A NEW PATTERN
All other air pumps superseded.
FORTIN'S STANDARD BAROMETER
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 24 : 5 : 0. LIST F.45. Pulsometer Engineering.com
Qine Elmoilronworks. Reading
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 lo 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 p'eces the 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 instrument is graduated in Fahrenbeit and Centigrade scales.
It is the BOLDEST Standard Barometer made. The PRICE IS LOWER than that of any other form of Standard Baroneter 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 tv 01 inch
and •1 millimetre. £3 7s.6d. Sole Manufacturers and Proprietors of the Regd. Design: PASTORELLI & RAPKIN, Ltd.,
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.
REYNOLDS & BRANSON,L". JOHN J. GRIFFIN & SONS
THE RYSTOS STAND DEVELOPING TANK. For Developing plates or cut films slowly in a very
weak developer. Clean in use; gives excellent results with a minimum
of trouble. MADE OF STOUT
Tank to take 6 plates 15" X 12", and with Adapters to suit
any smaller plate; complete, £1 : 10 :0 rbis arrangement is specially recommended to Radiographers and other
Scientific Photographers. 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 Postage on any of above three sizes, 4d. extra.
FOR CHEMICAL, BACTERIOLOGICAL,
PHYSICAL, and METALLURGICAL LABORATORIES.
NEW PHOTOGRAPHIC FRICE LIST, 25th EDITION, ON
Sardinia Street, London, W.C.
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.
AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.
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(Five Doors from Charing Cross.) New Catalogue (102 pp.) just issued, post free.
LANTERN SLIDES of Scientific Subjects,
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from 6/- per dozen.
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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. ng
1 See Nature, July 20, 1905, fage 277. Price, including box and packing, £4:6:6 THE MEDICAL SUPPLY
ASSOCIATION, 228 Gray's Inn Road, London, W.C.
Descriptire Circular upon application. CROSSLEY'S GAS ENGINES RECENTLY
GREAT REDUCTION REMODELLED.
GAS CONSUMED. Represents K and L types, giving 3.5 H.P.
Up to the end of 1904, and 5 H.P
over 51,000 gas and
CROSSLEY BRO respectively.
oil engines had been MANCHESTES
delivered, representImmediate Delivery
ing about threefor Stock Sizes
quarters of a million of Engines.
actual horse-power. CROSSLEY BROS., LTD., OPENSHAW, MANCHESTER NEW MICROSCOPIC SLIDES
From the New Issue of W. WATSON & SONS' No. 3 CATALOGUE, just published. Post Free on application.
Tsetse Flies (G. palpalis), whole insect
7 6 Perfume Glands on Leaf of Lavender ... Dissections of all parts may be had mounted separately. Also in
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3- & 41Send for Special Descriptive List.
Leg of Flea, showing muscular structure Blood-sucking Maggot (from the Congo)
76 Set of 16 Slides illustrating the development of an Ascidian Fly hatched from above, Auchmeromyia'luteola ...
25 0 Section of Brazilian Quartz, showing cavities containing fluid.
Trypanosoma Brucei (Tsetse Fly disease) Very interesting
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7 6 SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS. WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists,
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DALLMEYER'S TELE-PHOTO. LENSES & ATTACHMENTS
Enable you to take Photographs of Distant or Inaccessible
Subjects of sufficient size to be of practical value.
History Field Work (especially Ornithology), and also
Price from £3 15s.
Prices and Particulars on application. Estimales an!
advice free. J. H. DALLMEYER, Ltd.,
25 Newman Street, London, W., Stigmatic Lens fitted with Tele-Photo. Attachment.
MAKERS OF (These Attachments can be fitted to any good Lens.) THE CELEBRATED DALLMEYER LENSES. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MAILLON
AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 66 Fifth Avenue, New York. – THURSDAY, August 31, 1935