No. 61393. 



Moving Coil Mirror Galvanometers. 



887 



61 386. 1 : 6. 



61 388. 1 : 4. 



61 390. 1 : 5. 



61 392. 1 : . 



For using Xos. <>1,3S8 (il.391 as a Reflecting Galvanometer the Accessories listed in connect ion 

 with No. 61,342 are employed. 



s. d. 



61.392. Reflecting Moving Coil Galvanometer, Figure (German design), with rotary arm 

 for lens and glow lam]) (Ztschr. f. d. phys. u. chem. U. 22, p. 138). Price with single 

 filament glow lamp of 110 220 volts pressure I 8. 5. 



This galvanometer has been specially designed by us for lecture purposes and has the following ad van - 

 t i- -: (1 ) simplicity and complete comprehensiveness of the cons traction. (2) High sensitivity with light treat- 

 ment. (3) Two groups of turns of different resistance on the same moving coil; the galvanometer can conse- 

 quently be iis"d for all purposes with advantage without the coils first having to be changed, and the, 

 damping can be easily regulated. (4) The period of swing can be easily increased for ballistic purposes. 

 (5) The instrument can be conveniently set up and adjusted as a Reflecting Galvanometer. 



The galvanometer has one group of turns of approx. 100 ohms (1 mm deflection at 1 in distance 

 = approx. 1 xlO- 8 amp.) and a second group of turns of approx. 10 ohms (1 mm deflection at 1 m 

 distance = approx. 3 xH)- H amp.). The duration of the complete period of swing is 10 seconds without 

 weights and about 18 seconds with weights. 



Complete description sent on application. 



61.393. --idem, with Nernst Lamp (can only he supplied for 110220 volt D. C.) . . 8.10.0 



Unless otherwise stated, Lamp is supplied for llO volts. 



Accessories: see Nos. 61,313, 61,314, 50,121, 50,119, 50,122, 50,123, 50,124, on p. 879. 



Cl. 5107, 2375, 237(!, 

 2378, 5!>'J4. 



