Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 520
n the scale in place of degree numbers, we shallhave a direct-reading ampere-meter (ammeter). There is agreat variety of ammeters in use, for a description of whichthe student is referred either to technical works on the sub-ject or to the inventors themselves. We shall consider only one other… … I T I 1 h r d 1 m 1 i i 1 E 1 OOP 1 dl A 0 Fig. 388. c. The core carries a marker y; / is merely a wooden guide-rod for the tubular core. The action of this ammeter dependsupon the principle that when an insulated wire is wound intoa helix (called also a solenoid), and a current is passedthrough…
Physics
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