f 



mv' 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Of Nature trusts the mind -which builds for aye." — Wordsworth. 



No. 2244, Vol. 90] THURSDAY, OCTOBER 31, igi2 



[Price Sixpence 



Registered as a Mewspaper at the Genera! Post Office. ) 



[All Rights Reserved. 



LANTERN 

 POX^AFSISCOPE. 



Elbow PolariSeope, for illustrating tfie various phe- 

 nomena of polarized light, with polarizing glass plates, 

 prism and lenses, mounted in brass, with rack adjustment 

 to focus tube, in case, complete, ST Ts. 



IVES^W^TOKT «SC CO. 



WIGMORE ST, LONDON, 



THE "LONDON " 

 MICROSCOPE. 



A New Form for Research Work. 

 (THE RECENT MODEL) 



Slow motion four times 

 finer than usual. 



Swing-out centring and 

 focussing substage. 



Iris diaphragm in stage 

 level with surface. 



Finder divisions to 



mechanical stage, &c. 



CANTOR LECTURES 



By Conrad Beck 



on the Theory of the 

 Microscope, Price 1/= 



R.&J.BECK,Ltd., 



68 CORNHILL, E.C. 



ICEIYffOX^DS &, -BHAIiSOTf, X^td. 



RYSTOS" MICROSCOPE 

 PLATFORM 



Cold Medals - 

 London 190S 



Allahabad 1911 

 Grand Prix Turin 1911 

 2 Medals York 1912 



For use with the Stroud & Rendell Science Lanterns. This platform 

 is adjustable, so that any ordinary microscope (the draw tube being 

 removed) can be used for projection work. The platform can be raised 

 or lowered in order that the optical centre of the microscope may 



coincide with that of the lantern £17 6 



Catalogite of Optical Lanterns and (Uscrifiiive circular of Accessory 

 Apparatus for the S. Sf R. Lanterns, post free. 



14 coiv[]yiE:x{ciA.iL. srrxiE:E:'r, i;,e:e:ds. 



NEGRETTI & ZAMBRA'S 



Standard Meteorological Instruinent& 



38 Holborn Viaduct. 



London, E.C. 



45 Cornhill, E.C. 



122 Regent Street, W. 



A model set of instruments for a British Climatological Station. 



