Douglas Small Multi-Winding Machine

Douglas Small Multi-Winding Machine.

This machine is intended for the winding of very small coils for hearing aid and miniature radio and electronic work. It will wind either one coil at a time or two, three, or four simultaneously.

The motor is built into the machine and is capable of running at speeds up to 4,000 r.p.m. with control by means of a foot rheostat.

Coils from ⅛” (3·2 mm.) to ¾” (19 mm.) long and up to 5" (127 mm.) in diameter or diagonal can be wound, but the total weight of the coils must be low since the power available is only 1/30 h.p.

Wires from 0·0016" (0·04 mm.) to 0·0092" (0·23 mm.) can be wound and the spacing of the wire is achieved by means of a variable friction device.

Here you find 82 models, 79 with images and 41 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Avo (Brand), Automatic Coil Winder and Electrical Equipment Co., Avo Ltd; London