International Instrument Co., 



MAKERS AND DEALERS IN 



HIGH GRADE SCIEMTIFIC 



LABOKATOJiy APPARATUS. 



EXECUTION OF NEW DESIGNS FOR THE 

 LECTURE TABLE, LABORATORY, AND FOR 

 INVESTIGATION. 



Fig. 4 



Plan 



11 



VARIABLE POTENTIAL 

 HINGED FARADAY RING 



TOR 



ETHER AND ELECTRON 



THERAPEUTICS, 



The SECONDARIES HAVING 



INTERCHANGEABLE. 



INDEPENDENT, 



REMOVABLE SECTIONS 



AND 



ADJUSTABLE SERIES 



SPARK GAPS. 



THE PRIMARY W/ITH 



VARIABLE RESISTANCE. 



18 9a 



10,000 to 100,000 volt medical coil. 



Send for information in regard to our new Chrono- 

 graph — Large Capacity Centrifuges — Thermostats 

 — Vacuum and Compression Air Outfits. 



International Instrument Co., 



2S Church St., Cambridge, Mass. 



