498 CATALOGUE OF EXHIBITS. 



2. Farad-meter. Made by E. V. Baillard. Exhibitedby M. 



I. PUPIN, 



3. Electrical Apparatus. Exhibited by the General Electric 



Co. 



a. Horizontal Edgewise Ammeter. 



b. Horizontal Edgewise Voltmeter. 



c. Standard Thomson Recording Wattmeter, 10 amperes, 



1 10 volts. 



d. Lamp-testing Wattmeter — 150 watts. 



e. Pocket Ammeter, 25 amperes. 

 f. Astatic Ammeter, 100 amperes. 



4. Electrical Apparatus. Exhibited by Queen & Co. 



a. A Complete portable cable testing outfit. 



b. The Queen-Le Chatelier pyrometer. 



c. An 100,000-ohm box. 



d. An Ayrton shunt box. 



e. A new D'Arsonval galvanometer. 



f. A portable photometer. 



5. Electrical Apparatus. Exhibited by the Westinghouse 



Electric Mfg. Co. 



a. Two-phase, Integrating Wattmeter. 



b. Two-wire, Single-Phase, Integrating Wattmeter, with 



Series Transformer. 



c. Two-wire, Single-Phase Integrating Wattmeter. 



d. Three-wire, Single-Phase Integrating Wattmeter, with 



Series Transformer. 



6. Apparatus for Tracing Alternating Current Curves. 



hibited by F. Townsend. 



F 



GEOLOGY AND GEOGRAPHY. 



In Charge of Richard E. Dodge. 

 I. Series of Maps Showing Progress in Topographic Work 

 during 1899. Exhibited by the United States Geolog- 

 ical Survey, C. D. Walcott, Director, Washington, D. C. 



