VIII. MEASUREMENT. 339 



1463. Edelmann's Compensation-galvanometer. 



M. Th. Edelmann, Munich. 



1464. Edelmann's Lecture-galvanometer. 



M. Th. Edelmann, Munich. 



1465. Edelmann's Small Mirror-galvanometer. 



M. Th. Edelmann, Munich. 



1466. Edelmann's Pocket Compasses, with absolute 

 measurements for electro-therapeutics. 



M. Th. Edelmann, Munich. 



1467. Du Sols-Raymond's Astatizing Magnet. 



M. Th. Edelmann, Munich. 



1468. Ordinary Compensator. 



M. Th. Edelmann, Munich. 



1469. Edelmann's Induction Galvanoscope. 



M. Th. Edelmann, Munich. 



1470. Large Galvanometer for Electro-therapeutic 

 Purposes. M. Th. Edelmann, Munich. 



1471. Differential Galvanometer, very delicate, with two 

 coils. (Becker, London.) H. Lloyd, Trinity College, Dublin. 



1474. Apparatus to illustrate some of the laws of electrical 

 rotation of Faraday and Ampere. Yeates Sf Sons. 



1475. Tangent Galvanometer. James How fy Co. 



1476. Thomson's Astatic Reflecting Galvanometer, 



round glass case, for lecture purposes. Elliott Brothers. 



The most sensitive instrument yet constructed for detecting the presence of 

 a current and measuring its magnitude. 



1477. Thomson's Astatic Reflecting Galvanometer, in 



square brass case, made by Elliott Brothers. Prof. tV. F. Barrett. 



The upper coil of this galvanometer has a very high resistance, the lower 

 a very low one ; the coils are used independently, hut require only one lamp, 

 and hence can readily he changed without any disturbance by merely chang- 

 ing the position of the plug. 



1478. Set of Shunts, for use with galvanometers, to reduce 

 the angle of deflections of the needle 10, 100, or 1,000 times by 

 shunting off the current, so that' only -j^, T ^j, or y^o" ^ tne 

 current passes through the galvanometer, and the remainder 

 through the shunts. Elliott Brothers. 



1479. Simple Horizontal Galvanometer, coiled with stout 

 wire of low resistance, intended especially to show thermo-electric 

 currents. Elliott Brothers. 



Y a 



