. X-ray manual : Army . transformer; theinlet side should be raised an inch or so to get completeexpulsion of the air. It is well to operate at a lowpower, allowing sparks to pass across an inch gap forsome time to dislodge small air bubbles before puttingit into service. Use no oil not furnished for the purpose by a reliablemanufacturer, it must contain no moisture. Examine the oil level every two months to be sure itfills the tank. An exposed coil is sure to break downby puncture of the insulation. The top of the case shouldbe kept free from oil and dirt. For protection againstsurges or
. X-ray manual : Army . transformer; theinlet side should be raised an inch or so to get completeexpulsion of the air. It is well to operate at a lowpower, allowing sparks to pass across an inch gap forsome time to dislodge small air bubbles before puttingit into service. Use no oil not furnished for the purpose by a reliablemanufacturer, it must contain no moisture. Examine the oil level every two months to be sure itfills the tank. An exposed coil is sure to break downby puncture of the insulation. The top of the case shouldbe kept free from oil and dirt. For protection againstsurges or sudden high tension pulses which are likely todamage the transformer, a resistance should be placedin shunt with the low tension terminals. If this isnot provided by the maker, ordinary lamps may beused. Fig. 13. The middle of the secondary is usually connected tothe case (grounded); this insures a distribution of po-tential equally above and below the earth , if the terminal voltage is 40,000 volts, then the. Fig. 13. Protection from surge by use of a lamp. Transformer
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