Nice Antenna Tuner photos

A few nice Antenna tuner images I found:

Image from page 499 of “QST” (1915)

Image by Internet Archive Book Images
Identifier: qstamer00amer
Title: QST
Year: 1915 (1910s)
Authors: American Radio Relay League
Subjects: Radio Radio
Publisher: [Newington, Conn., etc., American Radio Relay League]
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
Fig. 2 — Voltage vector relationships for conditions(A) — when the antenna is resonant, (B) — when theantenna is above resonance, and (C) — when the an-tenna is below resonance. Voltages refer to Fig. 1. May 1955 15 CONTROL /a 12 AT 7

Text Appearing After Image:
TO XMTR TO ^FIG.4 ■*- l-^—-A–^–^ fig. 3 — Circuit of the automatic mobile antenna tuner. Ci — Mica; all other capacitors are disk ceramic. Ri — IRC type Q. Rs — Ohmite type AB. R4 — Wire-wound. All other resistors 10 per cent carbon, }/2 watt, unlessotherwise specified. Li — Approx. % turn No. 16 wire, over center of L2.L2 — 20 turns No. 18 enameled wire close-wound, center-tapped on ^-inch bakelite rod.Ii, I2 — Green and amber ^-inch indicator lamps.Ki, K2 —■ S.p.d.t. plate-circuit relay, 10,000 ohms (Potter-Brumfield LBS).Si —3-pole 4-position rotary switch (Mallory 3234-J). In the event of antenna detuning or a changein transmitter frequency, a change in the currentand voltage phase relationship along the trans-mission line will result, and a balanced outputfrom FiA and Fib will no longer exist. It mayagain be said that the reference voltage intro-duced by the capacitive coupling is in phasewith the voltage along the line, but there is nolonger a 90-deg

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