A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



THE SNOOK X RAY 



Interrupterless Machine 



IS THE BEST APPARATUS 

 FOR RESEARCH WORK 



No Interrupter. 

 No Inverse Current. 

 Completely under control. 

 Conditions can be absolutely 

 reproduced from day to day. 



S»lt Makers for the United Kingdom— 



NEWTON & WRIGHT, Ltd. 



72 WIGMORE STREET, W. 1. 



DUROGLASS L™- 



14 CROSS STREET, HATTON GARDEN, E.C. 



Manufacturers of 



Borosilicate Resistance Glassware. 



Beakers. Flasks, Etc. 



Soft Soda Tubing for Lamp Work. 



General Cbemical and 



Scientific Glassware. 



Special Glass apparatus Made to Order. 



DUROGLASS WORKS, WALTHAMSTOW. 



AGENTS: 



BAIRD & TATLOCK (LONDON) LTD. 

 14 CROSS ST., HATTON GARDEN, E.C. 1. 



REYNOLDS & BRANSON, Ltd. 



Makers to Hi: 



issware, Chemical and Physical Apparatus 

 Majesty's Government (Home and Overseas 

 Dominions). Laboratory Outfitters, &c. 

 Gold Medals at Allahabad and London. Grand Prix and Cold Medal 

 at the International Exhibition, Turin. 



STROUD & RENDELL SCIENCE LANTERN. 



The " University " Lan- 

 tern, with Russian iron 

 body, sliding baseboard, two 

 superior objectives, with rack 

 and pinion fur focussing, con- 

 densers 4 \ in. diam., plane 

 silvered mirror " A," which is 

 moved by a knob causing the 

 rays to be reflected upwards 

 for the projection of objects 

 in a horizontal plane, silvered 

 prism which can be used at 



in mount " D,"' limelight 



burner, slide carrier. Price 



complete in travelling case, 



£15 11 



ditto, with " Phoenix 

 adjustable stage 



supporting apparatus 



17 5 

 10 



CATALOGUES (Post free). 



Optica) Lanterns and Accessory Apparatus. 

 Chemical Apparatus and Chemicals. 



14 COMMERCIAL STREET, L.EfcJDS- 



BECKMANN THERMOMETERS 



With 6 degrees Centigrade divided 

 into 001° C, are now made 

 throughout at our own works. 



NEGRETTI & ZAMBRA 



38 HOLBORN VIADUCT, E.C. 1 

 5 LEADENHALL ST., E.C. 3 

 122 REOENT STREET, W. 1 



LONDON. 



