SCIENCE— ADVERTISEMENTS 



Reading Device 

 for Thermometers 



C1365, $,4.00 

 Send for Catalog 



Our Laboratory Spectrometers 



Are sold in competition with instruments of European meike 

 to many of the best laboratories throughout the world. 



WM. QAKRTNER AND CO. 



Physical and Astronomical Instruments 

 5345-49 Lake Park Avenue 



CHICAGO 



The Silverman lllummator 



A new eye for the microscope 



Offers important advantages (or practically every application of the Microscope 



a — It shows more detail. 



b — A clearer and better defined picture is presented to the eye and the camera. 

 C — Several novel methods of illumination can be produced. 

 d — It saves very much valuable time. 

 e — It prevents eye strain, eye fatigue, and brain fag. 

 / — It can be lowered into deep, hollow places. 



g — It gives excellent results for very low power work as well as higher magnifi- 

 cations, also in oil immersion work. 

 h — It can be used with any Microscope, ordinary or binocular. 



A small circular tube lamp 

 surrounds the objective £ind fur- 

 nishes a diffused and imiform il- 

 lumination directly where it is 

 needed. The Silverman Illumi- 

 nator marks 



A Great Advance in 

 Microscope Illumination 



For sale by a.11 the better dealers 



Write for 



Bttttetin 45-6 



Lydwig Honinriel 8s. Co. 



530-534 Ferff^ando St, PITTSBURGH. P 



