SCIENCE— ADVERTISEMENTS 



Unusual Opportunity for a Trained Scientist 



for Consulting:, Development and 



Research Work 



To be responsible for theoretical correctness of a great variety of Scientific Apparatus for class-room 

 demonstration as well as for industrial laboratory use, etc., manufactured by a leading house. Also 

 to conduct any necessary research along all scientific lines and to supply the results of his investi- 

 gations in such shape (sketches or specially constructed samples made under his direction) that 

 they will be economically manufacturable (mostly in small quantities), along modern lines, without 

 too much redesigning; ; 



Requires a man with very thorough theoretical (electrical. 

 physical, chemical) training — at home with all apparatus 

 pertaining to research and demonstration; whose state- 

 ments and reports can be relied upon as authoritative. 

 Must be a real apparatus-man. With sufficient practical 

 designing and manufacturing experience to fully meet the 

 above requirements. Also possibly to direct a small experi- 



mental department. And possibly to supervise final in" 

 spection of our products. Must know where to secure 

 promptly any sort of scientific information and should have 

 wide acquaintance among leaders in the scientific world. 

 Above all, must be able to imagine himself in the user's place 

 and act accordingly. Must be of tranquil mind and able 

 to work freely with our organization. Age up to 50 years. 



To such a man we offer a very responsible position, with suitable compensation, amid congenial 

 folk. To the right man this presents an opportunity to build up a department of industrial research 

 the scope of which ultimately will be limited only by his vision and ability. Replies will be held in 

 strictest confidence and no reference will be investigated without permission. Please give as con- 

 cisely as possible all essential facts relating to theoretical training, practical experience, and other 

 qualifications, as well as salary and when available for this position. 



Address: MAN UFACTURER, care of SCIENCE PRESS. Qarrison, N. Y. 



Compression Carbon Rheostats 



For service that requires exceeedingly *'fine'* and uniform current regulation, we offer the fol- 

 lowing rheostats: — 



Approximate 

 •-all 



♦This rheostat is supplied with an extra movable terminal plate, as shown 



Dimensions 

 154" long 4i" wide 



5J" high 

 20" long 5i" wide 



6" high 

 22" long 7|" wide 



7i" high 

 22" long 8" wide 



9" high 

 the picture. 



$12.50 



$25.00 



$50.00 



Price on 

 application 



ES G. BIDDLE 1211-13 arch st., Philadelphia 



