High frequency apparatus, design, construction and practical application; a practical treatise for electrical engineers, electricans, physicians, students and experimenters (1920)
Curtis, Thomas Stanley · New York, Norman W. Henley publishing company · leaf 153
Fig. 72.—The complete oscillation transformer wood are cut by means of a scroll saw and mounted upon alength of dowel rod which is in turn carried in the simplewooden uprights which form the bearings. Slats of thinwood are then nailed to the discs to form the conical cage. … Fig. 73.—The improvised winding machine In forming the paper cone, red rope insulating papershould be used. This paper is heavy and stiff and it has STANDARD OFFICE EQUIPMENT 149 excellent insulating properties. A disc of paper of the cor-rect size to form the cone should first be cut. The size…
Electric apparatus and appliances
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