. The American journal of roentgenology, radium therapy and nuclear medicine . the top ofthe transformer case, and then, as the oilexpands, it would compress the air in thisspace. But to save weight and bulk, the tankis made as small as is safely consistent withthe required high tension insulation. Such atransformer could be operated when rightside up, but in certain other positions itwould be found that there was air wherethere should be oil, and that the transformer,if operated, would break down. The field of usefulness of the device isgreatly extended by making it possible tooperate it in a
. The American journal of roentgenology, radium therapy and nuclear medicine . the top ofthe transformer case, and then, as the oilexpands, it would compress the air in thisspace. But to save weight and bulk, the tankis made as small as is safely consistent withthe required high tension insulation. Such atransformer could be operated when rightside up, but in certain other positions itwould be found that there was air wherethere should be oil, and that the transformer,if operated, would break down. The field of usefulness of the device isgreatly extended by making it possible tooperate it in any and all positions. This re-sult is attained l)v the use of the air cham- temperature to which the device will ever besubjected, the inner end of the capillary willalways be below the level of the oil in thechamber. The balance of the chamber isfilled with air at atmospheric pressure. Themain tank is filled full of oil so that the onlyair in the device is that in the special airchambers. Figs. 5 and 6 show the position of the oillevel with respect to the inner end of the. Fig. 3. 184 Oil-lmniersed A-Ray ; Outfits capillary tube, with two other positions ofthe air chamber 4. In no position of thechamber can the air escape into the maintank. 5. Alloziahlc Temperature Range of Op-eration.—With the design in question, thetotal amount of oil involved is 11200 total volume of air at atmospheric pres-
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