Ko. 62033. 



Bridges. Potentiometers. 



927 



I I I I I I |IIM|IMI|llll|llll|IHI|HII|llll|lllf| 



10 20 30 40 50 60 70 



I I I 



80 90 



100 



62031. 1:8. 



62033. 1:5. 



Second Graduation for reading direct the resistance, obtained from the simple mea- 

 suring wire, without the additional resistances 



Compare also the Universal Galvanometer No. 61,362, p. 885, which can be used also as a 

 Wheatstone Bridge. 



62,03 1 . Portable Bridge, Figure, comprising a plug resistance of 1 to 500 ohms, 2 shunt 

 resistances each of 1, 10, 100 ohms, Deprez-d'Arsonval Galvanoscope, 3 dry cells and 

 2 keys. Eange 0.1 to 100,000 ohms. With leather case and carrying strap .... 



s. d. 

 0. 12. 



11. 10.0 



<)'_'. <32. Thomson Double Bridge for Measuring Small Eesistances, Figure 



The apparatus consists of a measuring wire with millimetre scale and two knife edges, and clipping 

 arrangement on wood base, on 'which are placed two shunt knife edges which can be adjusted at different 

 distances, also two comparison rheostats having resistances of 1000, 100, 10, 10 ohms. In addition terminals, 

 battery keys and connecting cables as well as a test bar of copper of 1100 mm length and 10 mm diameter 

 are given in with the apparatus. The instrument can also be used as a single Wheatstone Bridge and as 

 a du Rois-Reymond current compensator. 



<>'_', 033. Potentiometer for measuring potential differences of 0.001 190 volts by comparison 



with a standard cell, Figure. Price without standard cell, but with galvanometer 25. 0. 



The apparatus contains: a switch contact resistance, 2 slide wire resistances, a pointer galvanometer, 

 a change over switch for the standard cell and the potential difference to be measured, also a galvano- 

 mctcr switch. In addition to measurements of potential the apparatus can, with the aid of standard re- 

 MMaiirrs Nos. 01,914 61,923, be used for accurate current measurements. As standard cells, we give the 

 preference to the use of a Weston No. 60,732, p. 845, but a Clark No. 00.731, p. 845, can also be used. 



Cl. 3528,2505, 5910 , 

 5909 a. 



11. 0.0 



