0
B. T. U. per hour = 57 B. T. U. per min. = 0.95
B. T. U. per second = 3.54 pounds of water
evaporated per hour at 212.

1 Watt = 1 joule per second = 0.00134 horse-power = 0.001
kilowatt = 342 B. T. U. per hour = 44.22
foot-pounds per min. = 0.74 foot-pounds per second
= 0.0035 pounds of water evaporated per hour at
212 degrees.

1 B. T. U. (British Thermal Unit) = 1,052 watt-seconds = 778
foot-pounds = 0.252 calorie = 0.000292
kilowatt-hours = 0.000391 horsepower-hour
= 0.00104 pounds of water evaporated at 212
degrees.

1 Foot-pound = 1.36 joule = 0.000000377 kilowatt-hour =
0.00129 B. T. U. = 0.0000005 horsepower-hour.

1 Joule = 1 watt-second = 0.000000278 kilowatt-hour =
0.00095 B. T. U. = 0.74 foot-pounds.

CHAPTER XVII

INVENTIONS AND PATENTS, AND INFORMATION ABOUT THE RIGHTS AND DUTIES OF
INVENTORS AND WORKMEN

There is no trade or occupation which calls forth the inventive faculty
to a greater degree than the machinist's. Whether it be in the direction
of making some new tool, needed in some special work, or in devising a
particular movement, or mechanical expedient, the machinist must be
prepared to meet the issues and decide on the best structural
arrangement.

Opportunities also come daily to the workers in machine shops to a
greater extent than other artisans, because inventors in every line
bring inventions to them to be built and experimentally tested.

A knowledge of the rights and duties of inventors, and of the men who
build the models, is very desirable; and for your convenience we append
the following information:

The inventor of a device is he who has conceived an idea and has put it
into some concrete form.

A mere idea is not an invention.

The article so conceived and constructed, must be both _new_ and
_useful_. There must be some utility. It may be simply a toy, or
something to amuse.

If A has an idea, and he employs and pays B to work out the device, and
put it into practical shape, A is the inventor, although B may have
materially modified, or even wholly changed it. B is simply the agent or
tool to bring it to perfection, and his pay for doing the work is his
compensation.

An i