Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 241
strong, as a strong light is veryinjurious to the eye; nor should the light be too dim,as the eye strain is considerably increased. The lightsshould always be so arranged that the direct rays oflight do not fall on the eye. CHAPTER XVII NERNST LAMP Figure 148 shows a diagram of the Nernst Lamp.The… … through the fine wire of the heater H which soon heatsthe glower so that current begins to flow through it.When this current attains approximately its normalvalue the magnet M attracts the cut-out C and in sodoing opens the heater circuit and prevents furtherconsumption of energy. B is a fine iron…
Electrical engineering · Electric testing
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