.0 U J ■ I 



SCIENCE 



New Series 



Vol. LV, Ko. 1429 



Friday, May 19, 1922 



SmoLE Copies, 15 Cts. 

 Annual Subscription, $6.00 



A New Microscope Lamp 



The g-reat advance made in incandes- 

 cent lamp manufacture in recent years 

 has made possible this new, superior 

 microscope lamp, which offers the fol- 

 lowing advantages : 



1. Can be used witk both tbe Abbe condenser and Dark-Gi-ound Illuminator, 

 with easy interchangeability; 



2. Provides a powerful light source for oil immersion work, as well as dark- 

 Held microscopy; 



3. Requires minimum time for adjustment ready for work; / 



4. Bulb used is a stock electric lamp, obtainable anywhere; 



5. Makes a substage lamp when no condenser is on the microscope. 



For oil immersion work, this lamp is attached to the Abbe 

 condenser, whether new or already in use on the microscope. The 

 bulb, which can be easily centered, by its position is always in the ^ 



focus of a strong curve condenser, so that parallel light of even 

 intensity is delivered. A special Blue Glass Disc is supplied fox 

 use in moderating the illumination when it is too bright. 



No. 1844 Microscope Lamp, including blue glass disc, 



bulb and cord, in case $13.00 



Resistance for 110-volt, direct or alternating current.. ..$ 6.00 

 'Wriie for illustrated, descriptive circular 



Bausch & Lomb Optical Go. 



409 St. Paul Street, Rochester, N. Y. 



New York Washington Chicago San Francisco London 



ng American Makers of Photographic Len 

 and Instruments, Photomicrographic Appari 



Reflectors. Stereo-Prism Binoc 



s. Microscopes, f 

 ■s. Range Finders, 

 irs. Magnifiers ar 



ojection Apparatus {Balopticons) , Ophthalmic Lc 



and Gun Sights for Army and Navy, Searchlight 

 i other high-grade Optical Product'. 



