omotive engine; the resistance of its field magnets is
5.68 ohms, and of the two armatures 33 ohms. The resistance of the two
armatures of the receiving machine is 36.8 ohms, and the resistance of
the line is 97 ohms; the generator and receiver field magnets are excited
each by a separate machine. Five different trials were made at varying
speeds of the driving shaft; the initial work on this shaft was measured
by a dynamometer, and the available energy of the shaft of the receiving
machine was ascertained by a Prony brake; the other results of the
experiments were deduced from the constants of the machines and from
galvanometric measurements. For the first trials the different elements
were as follows:

1. _Generating dynamos:_
Velocity of shaft 123 revolutions.
Electromotive force at terminals, 3370.25 volts.
" " total 3624.7 "
Available work at driving shaft. 43 h. p.
Electrical work of generator 37.38 "
Difference absorbed 5.62 "

2. _Line:_
Work absorbed by the line. 7.59 h. p.

3. _Receiving dynamos:_
Velocity of shaft 154 revolutions.
Electromotive force at terminals, 2616.25 volts.
" " total 2336.94 "
Electrical work of receiver 24.10 h. p.
Available work on shaft 22.10 "
Difference absorbed 2 "

The duty obtained would thus be 22.10/43 = 51.3 per cent., if the work
absorbed by the exciting machines be not considered. Taking this into
account, it would be reduced to 40 per cent.

In subsequent experiments the speed of the generator was increased
gradually. In the last trial the following were the elements:

1. _Generating dynamos:_
Speed of shaft 190 revolutions.
Electromotive force at terminals 5231.25 volts.
" " total 5469.75 "
Available work on driving shaft, 62 h. p.
Electrical work on generator 53.59 "
Difference absorbed 8.51 "
Work absorbed by armature 2.33 "

2. _Line:_
Work absorbed by conductors 7.21 h. p.

3. _Receiving dynamos_:
Speed of shaft 248 revolutions.
Electromotive force at terminals 4508 volts.
Electromotive force total 4242.67 "
Electrical work of receiver 41.44 h. p.
Work measured on receiver shaf