Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 40
this drawing of ascale will observe that the deflections, whenthey approach an angle of 90°, are far tooclose together for accurate reading; hencethe scale is reliable only over a short range,say between 2P ^^^ 60° of deflection, 45°being the mean. Fig. 22 represents the ordinary instru-ment in its… … Fig. 22.—Tangent Galvanometer Tangent Instruments or 70° deflection with stronger currents, and correct readings aredifficult. A modification of the instrument is shown in Fig. 23, whereinthe wire ring is carried on a cross-shaped platform. The compassneedle can be slid along the axial extension,…
Electrical engineering · Electric power
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