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The Talking Machine World, New York, August 15, 1924
Twenty-four Improvements help you sell the
MONOTROL
REG. U.S. PAT. Of I
1 — 3 stages of tuned radio frequency combined with the advantages of the Inverse Duplex System.
2 — All the selectivity of the hest tuned circuits, yet with only one tuning dial.
* 3 — The Sleeper Synchronized Dual Condenser, operating tuning condensers on a single shaft.
4 — Universal operation using any kind of loop, or aerial, or ground wire alone, depending on location.
5 — Operates from either wet or dry cell batteries with either type of tube.
6 — Tremendous power with fewer tubes — rectification, 3 stages of tuned radio frequency and 3 stages of audio amplification from only 4 tubes.
7 — Use of efficient Sleeper Reetiformer in place of the usual noisy detector tube.
8 — Exceptionally pure tone due to new principle of audio amplification with Sleeper Audoflex Transformers.
** 9 — Socket block floating on aeroplane rubber, eliminating microphonic noises.
10 — Recessed coil springs under each leaf contact.
11 — A novel system of stabilizing radio frequency.
12 — A novel in-put circuit, using same binding posts for aerial or loop.
13 — Local-to-Distance Switch, controlling volume without affecting tuning.
14 — New intensity control, saving current from all batteries.
15 — Metal panel and framework, eliminating body capacity effects.
16 — Improved type of filament switch.
17 — Beautiful cabinet of solid inlaid African Mahogany — Sheraton Period.
18 — Natural or 30° eye-to-hand slope, increasing visibility of dial readings and making operation more convenient.
19 — Satin finish panel, etched in oxidized bronze.
20 — Self-containing compartments for "B" batteries and dry cells.
21 — Tuning dial calibrated in wave lengths as well as numbers.
22 — Utilization of common ground, eliminating unnecessary wiring connections.
23 — Improved construction, using the famous Doehler Die Castings throughout.
24 — All battery connection wire coded in color.
The Sleeper Floating Socket Block
Sleeper Synchronized Dual Condenser