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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

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