884 



Voltaic Electricity. Section 3: Electro- Magnetic Current Measurements. 



No. in :;t: 



61 347 A. 1:5. 



61 347 B. 1:5. 



61 354. 1:6. 



61,347. Iron-Clad-Galvanometer after Du Bois-Kubens, Figures A and B (Ztschr. f. In- (1 

 strumentenkunde, 1900, p. 65), with a light and a heavy magnet suspension with plane 

 mirror, two pairs interchangeable internal directing magnets, one pair external directing 

 magnets and two coils of 2000 ohms each in cast steel sheath, with spherical sheath as 

 a second magnetic shield and cast steel cylinder as third magnetic shield 37.10.0 



Fig. 61,347 A shows the outside appearance in conjunction with an anti-vibration suspension 

 No. 61,357; Fig. 61,347 B illustrating the instrument with the second and third shield removed. 



This type of galvanometer is constructed in view of the disturbing magnetic influences of 1 

 electric tramways; the steel envelopes have a strong protecting action against these influences. Each 

 suspension is supplied packed in a small box with a plane mirror. 



61,348. Iron-Clad Galvanometer after Du Bois-Eubens, as No. 61,347,-but with eight terminals 



and one pair of coils with differential winding each of 2 x 1000 ohms in cast steel envelope 1 1 . 



61,350. 

 61,351. 

 61,352. 

 61,353. 



Accessories and Spares for Nos. 61,347 and 61,348: 



61,349. 2 Coils each of 5 ohms in cast steel sheath <>. 



2 Coils each of 100 ohms in cast steel sheath >. 



2 Coils with differential winding each of 2 x20 ohms, in cast steel sheath 7. 



1 Light Magnet Suspension including Mirror, 35 mg 1. 



1 Heavy Magnet Suspension including Mirror, 165 mg .' 1. 



61.354. Metal Stand, with glass bell, Figure, for suspending the magnet stirrups 0. 



61.355. 1 Small Box with 10 Quartz Fibres on mirror base o. 



Shunt of Copper Wire for the coil resistance of 2 x2000 ohms: 



61.356. 1/9. Vti. Vt.i - 



61,356 a. 1/9. V.9, V,.., V.. ....- 7. 



61, 356 b. 



V,9. V* 



I/ I/ 



/49> 19 





Id. 



5.0 



10. O 

 10. O 

 !.->. ii 



,-). I > 



13. O 



IS. o 



:.. 



o o 

 1.-.. n 



10. O 



61,357. Arrangement for the anti-vibration suspension of the Du Bois-Rubens Iron-Clad Galvano- 

 meter, as suggested by Hagen 6. t. 



The device, like that of the Julius method, is fitted directly on the east steel cylinder; when ordering, 

 the iron-clad Galvanometer should be sent us or the instrument should be ordered together with the 

 device. 



Moving Coil Galvanometers. 



The generally recognised advantages of the Deprez-d'Arsonval Galvanometers with 

 fixed magnet and moving coil are: independence of external magnetic influences; good 

 damping and insensitivity to rough treatment render the instruments specially suitable 

 for educational and practical purposes. We are therefore including in the following pages 

 an extensive selection of these instruments. 



61,358. Portable Moving Coil Needle Galvanometer, with hand suspension for the coil. F i g n t e. 

 suitable for /,ero methods (Whcatstone Bridge and t lie like) and for stii<lenl>' exercises. 



1'. KM) 



approx. resistance 150 ohms; 1 degree deflection approx. 1 -10 ' ; amps. 

 61,350. -- idem, arranged for hanging on the wall 3. 15.0 



(1. .-,11(11. .'SHIP. -JU 



