Wireless Telegraph Construction For Amateurs

Wireless Telegraph Construction For Amateurs is a book by Alfred Powell Morgan. The title page promises 167 illustrations and a complete description of the new wireless law. The text says that the open and closed circuits of a tuning helix constitute an oscillation transformer, and that circuits very close together or intertwined are said to be closely coupled.

The text describes a closely coupled tuning helix suitable for ordinary induction coils giving sparks up to 3 or 4 inches in length, with heads that are circular pieces of hard wood 1 inch thick and 12 inches in diameter. The contents list names chapters on Oscillation Condensers and Leyden Jars, Spark Gaps or Oscillators, and Transmitting Helixes, among others. The text says two strips of fiber 12 x 2 1/2 x 1/2 inches are bored with corresponding holes in their ends, and that these strips are placed at the end of the transformer, on top of the core, with 1/4-inch bolts passed through the holes in the fiber and the core.