XI. SHORT WAVE REGENERATIVE RECEIVING SETS

A Short Wave Regenerative Receiver, with One Variometer and Three
Variable Condensers--The Variocoupler--The Variometer--Connecting Up
the Parts--Short Wave Regenerative Receiver with Two Variometers and
Two Variable Condensers--The Parts and How to Connect Them Up.

XII. INTERMEDIATE AND LONG WAVE REGENERATIVE RECEIVING SETS

Intermediate Wave Receiving Sets--Intermediate Wave Set With Loading
Coils--The Parts and How to Connect Them Up--An Intermediate Wave Set
with Variocoupler Inductance Coils--The Parts and How to Connect Them
Up--A Long Wave Receiving Set--The Parts and How to Connect Them Up.

XIII. HETERODYNE OR BEAT LONG WAVE TELEGRAPH RECEIVING SET

What the Heterodyne or Beat Method Is--The Autodyne or Self-heterodyne
Long Wave Receiving Set--The Parts and Connections of an Autodyne or
Self-heterodyne, Receiving Set--The Separate Heterodyne Long Wave
Receiving Set--The Parts and Connections of a Separate Heterodyne Long
Wave Receiving Set.

XIV. HEADPHONES AND LOUD SPEAKERS

Wireless Headphones--How a Bell Telephone Receiver is Made--How a
Wireless Headphone is Made--About Resistance, Turns of Wire and
Sensitivity of Headphones--The Impedance of Headphones--How the
Headphones Work--About Loud Speakers--The Simplest Type of Loud
Speaker--Another Simple Kind of Loud Speaker--A Third Kind of Simple
Loud Speaker--A Super Loud Speaker.