No. 61 531. 



Demonstration Instruments. 



903 



61 528. 1 : 6. 



61 531. 1 : 6. 



61,526. Additional Voltage Coils for increasing the voltage range of Nos. 61,523 and 61,524 \ s. d. 

 in stages of 50 volts each, so that e. g. four extra coils are used for a range of 

 250 volts Price each 



61,527. Universal Measuring Instrument for Direct Current, Deprez-d'Arsonval system, 

 Figure, suitable for current and voltage measurements and for use as a galvanometer 



The instrument has a scale visible from both sides. The following are the ranges: 

 As a Galvanometer: 0.015 .0 0.015 amp with upprox. 10 ohms resistance. 

 . 202 and 15015 amps. 

 3 3 and 50 50 volts. 



As an Ammeter: 

 As a Voltmeter: 



r.l.:>i>8. Universal Demonstration Moving Coil Galvanometer with scale visible at a distance, 

 for Direct Current, Deprez-d'AreonvaJ system, Figure, can be used both as a pointer 

 galvanometer for zero methods (resistance measurements and the like) and as a volt- 

 meter and an ammeter. Total height 450 mm, in glass case 



This instrument has been designed to satisfy the need of an apparatus adaptable for use in as many 

 ways as possible as well as for technical measurements of large current-densities. The graduation is visible 

 at a distance. We have thus five instruments comprised in one, i. e. : 



(1) Galvanometer. 



(2) Voltmeter to 3 volts. 



(3) Voltmeter to 30 volts. 



(4) Ammeter to 3 amperes. 



(5) Ammeter to 30 amperes. 



All leads are laid in the open and can be seen easily at a distance. The connections are changed 

 over by plugs. 



61,529. - - idem, considerably larger, total height 60 cm 



<> 1, 530. Demonstration Moving Coil Voltmeter, for Direct Current, Deprez-d'Arsonval system, 

 cf. Fig. 61,531, with scale visible at a distance; with two ranges, 3 and 30 volts, 

 in glass case. Total height 450 mm. Can also be used as a Galvanometer .... 

 This instrument has the same advantages as No. 61,528; change-over by plugs. 



is 1. .vj l. Demonstration Moving Coil Ammeter for Direct Current, Deprez-d'Arsonval system, 

 Figure, with scale visible at a "distance; with two ranges, 3 and : 30 amps. 

 In glass case. Total height 450 mm; can also be used as a Galvanometer .... 



In this instrument, constructed in a similar manner to No. 61,528, change over is effected 



I iy plugs. 



0. 8. 



5. 0. 



7. 0. 



8. 8. 



6. 0. 



6. 0. 



Cl. 6005, 6002. 



