CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



207 



No. F4481. 



No. 4694. 



F4481. D'ARSONVAL KEPAIR KIT. Consists of a neat wooden box containing two pairs of forceps 

 for handling suspensions, a watchmaker's screw driver, suitable for small screws on any gal- 

 vanometer, 6 upper steel suspensions (see Xo. F4515) and 3 lower copper suspensions (Xo. 



F4483), all conveniently accessible. For use with No. F4453 Galvanometer $3.00 



F4482. D'ARSONVAL REPAIR KIT. Same as No. F4481, with phosphor bronze (see No. F4511) in- 

 stead of steel upper suspension 3.00 



F4483. LOWER SUSPENSION only, copper, spiral form, as used on No. F4453 Galvanometer 20 



F4491. GALVANOMETER MIRROR, plane, % inch diameter 35 



F4492. GALVANOMETER MIRROR, plane, % inch diameter 60 



F4493. GALVANOMETER MIRROR, concave, 1 meter focus, % inch diameter 1.50 



F4494. GALVANOMETER MIRROR, concave, 2 meter focus, / inch diameter 1.50 



F4511. GALVANOMETER SUSPENSION RIBBON, Phosphor Bronze, 0.001x0.013 inches.. Per foot .10 

 F4512. GALVANOMETER SUSPENSION RIBBON, Phosphor Bronze, 0.0007x0.005 inehes.Per foot .10 

 F451o. GALVANOMETER SUSPENSION RIBBON, Steel, 0.0013x0.004 inches Per foot .10 



GENERATORS 



4694. GENERATORS, Dynamos, Shunt Wound, 110 volt. The following General Electric Dynamos are 

 adaptable for all kinds of electrical lighting purposes, charging batteries, etc., etc., and are 

 guaranteed to be free from mechanical or electrical defects. The Dynamos are of approved 

 bi-polar construction, of the inter-pole or regulating-pole. type, insuring perfect commutation. 

 The prices include the Dynamos complete with Field Bheostat, Sliding Base and Standard 

 Pulley. 



No A B 



Power, kilowatts % % 



No. of 25 watt lamps 



Speed, r. p. m 



Diameter of pulley, inches 



Width of pulley face, inches 



Shipping weight, Ibs. 

 Each . 



No 



Power, kilowatts 



No. of 25 watt lamps 



Speed, r. p. m 



Diameter of pulley, inches. . . 

 Width of pulley face, inches. 



Shipping weight, Ibs 



Each . 



20 



2500 



3% 



2 



100 



143.45 



25 



1150 

 4% 



3 



185 



210.40 



30 

 2500 

 4% 



F 



1% 

 73 



2500 

 4% 



O 



170 

 207.90 



80 



1150 



4% 



4 



390 

 376.70 



120 

 153.75 



H 



2Yi 



90 



1700 



4% 



3 



270 

 344.75 



D 



1 



40 

 2500 

 4% 



2 



130 



178.60 



J 



3 



120 



1700 



4^2 



4 



390 

 376.70 



E 

 1 



40 

 1700 



4% 



170 

 202.10 



K 

 5% 

 220 

 1700 

 5% 

 4 



540 

 471.20 



For DEMONSTRATION DYNAMOS, see Catalog E. 



