Chapter 4 of 65
III. SIMPLE TELEGRAPH AND TELEPHONE RECEIVING SETS
The Radio Amateur's Hand Book A Complete, Authentic and Informative Work on Wireless Telegraphy and Telephony · A. Frederick (Archie Frederick) Collins
Assembled Wireless Receiving Sets--Assembling Your Own Receiving Set--The Crystal Detector--The Tuning Coil--The Loose Coupled Tuning Coil--Fixed and Variable Condensers--About Telephone Receivers-- Connecting Up the Parts--Receiving Set No. 2--Adjusting the No. 1 Set--The Tuning Coil--Adjusting the No. 2 Set.