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DYNAMO<br />
WITH<br />
REGULATOR<br />
CUTOUT<br />
GD 1915<br />
MOTOR<br />
WITH<br />
STARTING<br />
SWITCH<br />
GRAY & DAVIS<br />
STARTING-LIGHTING SYSTEM<br />
A Remarkable Advance in Electrical Equipment<br />
A Gray & Davis dynamo and starting<br />
motor of the 1915 type are shown above.<br />
The system as installed in different<br />
makes of cars varies somewhat to meet<br />
different specifications — but all installations<br />
are patterned after this general type.<br />
The Magnet<br />
Type of Frame<br />
You will notice that these units have<br />
a rectangular or magnet-shaped frame. This<br />
frame is constructed of one flat piece of low<br />
carbon steel formed into a U shape. A<br />
piece of the same quality of steel is bolted<br />
across the end.<br />
This innovation gives the following<br />
distinct advantages:<br />
(1) The frame is more rugged and will<br />
stand the most severe service.<br />
(2) It is more compact.<br />
(3) Magnetic leakage from the armature<br />
is avoided, thus conserving the<br />
full power developed.<br />
(4) Bearings are mounted in accurate<br />
alignment.<br />
(5) Field pieces are absolutely true.<br />
(6) The number of parts is materially<br />
reduced.<br />
Accessibility<br />
A notable feature of the 1915 type is<br />
its ready accessibility. By unscrewing the<br />
side plates, the interior is open for inspection<br />
or adjustment.<br />
Lubrication<br />
Convenient oiling places allow the lubricant<br />
to flow readily to all bearings.<br />
Voltage<br />
Our experience in building dynamos and<br />
motors has shown that 6 volts is the logical<br />
and economical pressure for automobile<br />
equipment. We do not require 12, 18, or 24<br />
volts, as is the case with some systems.<br />
A 6-volt battery means a genuine saving in<br />
battery weight, space, and maintenance<br />
cost. We require but a small 3-cell battery,<br />
the same as that used for ignition.<br />
Furthermore, the Gray & Davis dynamo<br />
and starting motor are designed to conserve<br />
the life and strength of the battery — a most<br />
important factor in the consideration of<br />
any electric system.<br />
Wiring<br />
The method of mounting the regulatorcutout<br />
and switch leads to a distinct reduction<br />
and simplification of wiring.<br />
We will be glad to supply complete data on request. Any detailed questions will be fully<br />
answered by special letter.<br />
GRAY & DAVIS, Inc., Boston, Mass.<br />
321 SCRIBNER'S MAGAZINE ADVERTISER