Electricians' operating and testing manual; a hand book for men in charge of electrical apparatus, repair men, trouble men, lamp trimmers, and electricians generally (1916)
Horstmann, Henry Charles, Tousley, Victor Hugo, 1875- joint author · Chicago, F.J. Drake & co · leaf 245
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 Nemst 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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