cxcvi NATURE [January 8, 1914 
PORTABLE EQUATORIAL 
MOUNTING 
FOR 3” TELESCOPES. 
NEW HIGH POWER Light but Firm. 
BINOCULAR MICROSCOPE, ape 
Easily Manipulated. 
eC1itz 
suitable for ordinary objectives, from 
the lowest to the HIGHEST POWERS, 
STAND AND 
including oil immersion objectives. 
‘ MOUNTING, 
Particulars may be had on application 
for Leaflet No. 20, post free. £15 15s 
2 
Any of the following Catalogues will be sent or 
post free on request. Mathie” Tele- 
A Microscopes. 
B Petrological and Metallurgical Microscopes. scope, 
C Dissecting Microscopes, Lens Holders, 
and Magnifiers 
D Microscopical Accessories. £30. 
E Haematological Appliances. 
F Microtomes. 
G Photo-micrographic Apparatus. 
H Projection Apparatus for Demonstration Illustrated Catalogue, 
and_ Drawing. Part I., Gratis. h | 
J Prism Binoculars for Field and Theatre. } "| | 
BLOOMSBURY SQUARE, W.C. J. H. STEWARD, Lta., 
A few doors fi he British M ie 
Pot inges sane ee es ee Opticians & Scientific Instrument Makers to the British & Foreign Gools., 
406 & 457 STRAND, LONDON. 
WATSON’S NEW APPARATUS 
British made at Barnet, Herts. Guaranteed for 5S Years. 
A Metallurgical List has just been issued, and includes 3 NEW MICROSCOPES. 
THE “VULCAN” MICROSCOPE. For examination of metals in course of manufacture. The vertical illuminator and illuminant are 
integral parts of the Microscone. lhe lamp is a 4 volt metal filament, and current obtained from a small battery. 
THE “WINDER” MICROSCOPE. Designed for examination of metals under strain when being tested. Molecular changes can be observed 
visually, photographically r by projection. Is fitted with the new Condenser Vertical [lluminator. 
NEW “MICROMETER” MICROSCOPE. For exact measurements of screws, &c. Reads by verniers and by a micrometer. Absolutely 
reliable and free ‘r m backla h usually associated with these instruments. 
NEW CONDENSER VERTICAL ILLUMINATOR. Consists of a tube containing a series of condensing lenses and a small electric 
lamp. ‘Two iris diaphragms are fitted, and the instrument gives a total freedom from glare. 
OTHER NEW APPARATUS:—RADIAL SWING-OUT FITTINGS FOR UNDERSTAGE AND SUBSTAGE CONDENSERS. 
THREE JAW OBJECTIVE CHANGER, obviates use of revolving nosepiece. DUPLEX EYEPIECE, for demonstration purposes. 
LABORATORY ELECTRIC LAMP. REFLECTOR POLARISER, designed by Mr. F. J. CuHEsHixe, B.A. DIFFRACTION 
MICROMETER EYEPIECE, designed by Mr. J. W. Gorpon. 
Fullest details and prices of the above will be found in the NEW METALLURGICAL CATALOGUE and the 
SUPPLEMENTARY MICROSCOPE LIST. Gratis on request, 
W. WATSON & SONS, Ltd. (**32U#"°¢), 313 High Holborn, London, W.C. 
Optical Works—HIGH BARNET, HERTS. 2 EASY ROW, BIRMINGHAM. 
Branches {16 FORREST ROAD, EDINBURGH. Depots (21 NOTRE DAME STREET WEST, MONTREAL. 
Tanches | 134 GREAT PORTLAND STREET, LONDON, W. 78 SWANSTON STREET, MELBOURNE, AUSTRALIA. 
1 
Back View. Front View. 
SPENCER DISSECTING MICROSCOPE No 86a SOLE AGENTS for Great Britain and Ireland (except London)— 
y 410. . ‘ 
Plate Glass Stage, mirror to reflect light to object. _ Hollow Block STAN DLEY BELCHER & MASON, Ltd., 
for Dissecting Instruments and Lenses. Witn 9x Doublet, 10/6 
Price List on application. Church Street, BIRMINGHAM. 
Printed by Rictarp Cray & Sons, Limirep, at Brunswick Street, Stamford Street, S.E., and published by MacmILLan AND Co., -Limurep, at 
St. Martin's Street, London, W.C., and THe Macmitian Co., 66 Fifth Avenue, New York.—THurspay, January 8, 1914. 
a oe > FT 
