frequently.

In order to give an idea of various battery capacities, below is a
table showing the number of 32 volt, 25-watt lamps which may be
lighted for various lengths of time from sixteen cells. The number of
hours shows the length of time that the lamps will operate.

Table A

Type 3 Hours 5 Hours 8 Hours
---- ------- ------- -------
G-7 22 Lamps 14 Lamps 10 Lamps
G-9 28 Lamps 19 Lamps 13 Lamps
G-11 32 Lamps 24 Lamps 15 Lamps
G-13 41 Lamps 29 Lamps 19 Lamps
G-15 47 Lamps 33 Lamps 22 Lamps
G-17 54 Lamps 38 Lamps 25 Lamps

Note:--Based on 32-Volt 25-Watt Lamps.

For example--The table shows opposite G-7 that, with the battery
fully charged, twenty-two lamps may be lighted for three hours,
fourteen lamps for five hours and ten lamps for eight hours, by a
sixteen cell G-7 battery, without operating the engine and generator.

Motors for operating various household and farm appliances are usually
rated either in horsepower or watts. The following table will give a
comparison between horse-power and watts as well as the number of
25-watt lamps to which these different sizes of motors and appliances
correspond.

Table B

H.P. of Motor No. of Watts Corresponding No. of
25-Watt Lamps
------------- ------------ --------------------
1/8 93 4
1/4 185 7
1/2 373 15
3/4 559 22
1 H.P. 746 30

From table B it will be seen, for example, that a one horsepower motor
draws from the battery 373 watts or the same power as do fifteen
25-watt lamps. Then referring to table A, it will be found that a G-11
battery could operate 15 lamps or this motor alone for 8 hours.

Due to the fact that a motor or electric appliance may become
overloaded and therefore actually use many more watts than the name
plate indicates, it is not advisable to operate any motor of over 1/4
H. P. or even an appliance of over 186 watts on the G-13 or smaller
sizes unless the engine and generator are running.

It is safe, however, to operate motors or other appliances up to 375
watts on the G-15 or G-17 batteries without operating the engine and
generator.

WILLARD FARM LIGHTING BATTERIES

[Fig. 328 Willard Farm Lighting Cell]

The Willard Storage Battery C