876 



Voltaic Electricity. Section 3: Electo Magnetic Current Measurement?. 



NO. 





61 295. 1 : .-.. 



61 294. 1 : 5. 



61 296. 1 : 2. 



61 297. 1:2. 



61299. 1:.8. 



61 300 A. 1:8. 



61,294. Model of a Multiplier, Figure, as suggested by Friedr. C. G. Miiller (M. T., s. d. 

 p. 256) 0. 10. 



61,295 Simple Horizontal Galvanoscope, Figure (M. P., 9"' edn., m, Fig. 474) . ... 0.18.0 



61.296. Horizontal Galvanoscope, round pattern, with arrestmert, Figure 0.15.0 



61.297. Horizontal Galvanometer, Figure, with bell-shaped magnet, suspended on raw 

 silk fibre, (mite aperiodic, with copper damper and pointer reading; extremely useful 

 for resistance measurements and the like when a permanently fixed instrument is not 

 available and without extensive preparation being necessary; with low resistance of 

 about 50 ohms; the two halves of the winding can lie used by the aid of 4 terminals either 

 singly, in series or differentially. The instrument is provided with reliable arrest ment 

 rendering it easily portable. Sensitivity: 1 deflection = approx. 0.00002 amp. . . . 5.10.0 



61.298. -- idem, with high resistance of about 1000 ohms. Sensitivity: 1 " deflection 



approx. 0.000005 amp 6. 0. 



(11,299. School Galvanometer, F i g u re. can also be used as a compass, differential galvano- 

 meter, and astatic galvanometer 3. 15.0 



The galvanometer is constructed in such manner that it can be taken to pieces and the individual 

 parts built up again and explained by the teacher. 



If one of the two magnets which is constructed of thin walled steel tube is slipped into the 

 lower sleeve., a compass or a magnet omrNer is obtained. 



If one (it the coils is placed parallel with the magnet a Minple galvanometer is the result. If 

 the other coil is added, the sensitivity can lie varied by putting in parallel or series or by displacing 

 in relation to the magnets. 



Damped vibrations are obtained liy placing the copper sleeve in the space between the coils. 



c . usso, .-,*.-,:!. 2:i:,<;. ->:i7l. 



.iS.f 1 , ,'i.s j'2 . 



