344 J. Nicklés on Different Applications of Magnetic Attraction. 
This part of the conductor is flattened, so as to present a con- 
venient surface ; a spring holds it off from the plate, and in this 
state the Circuit is open ; to close it, a key is touched which acts 
on the conductor, and presses it upon the connecting plate ; and it 
is broken by a contrary movement, when the spring throws o 
the conductor. 
On making the battery connection, a magnetic radiation is per- 
ceived to a great distance, so that at 5 meters from the wheel in 
the plane of the helix, small strips of iron may be magnetized. 
The result of the experiment made with the apparatus just 
described, has been made the subject of a report to the Minister 
of Public Works, by the commission already named. The fol- 
lowing numbers are cited from this document. 
The trial was made on a grade of 10 millimeters to the meter. 
The elements of the machine, were as follows ; 
Meters 
Diameter of pistons, - - ‘4 
Play of the pistons, *35.n0 ¥ 0-600 
Diameter of the driving wheels, 1-600 
Heating surface of the fire; - 779-600 
66 66 ‘sc es; - 7860 
tub 
Weight of the machine provided with its water 
and coke, - - - - - - 29 tons. 
Load on the rails to be drawn by the driving wheels, 14 tons. 
Pressure of the boiler, - - - - 6 atmospheres. 
The whole train, about - - . 119 tons. 
The rate of motion, per hour, - - 15 kilometers. 
again open. ‘T'o make the locomotive move in spite of the mag- 
netism, a pressure of 9 atmospheres was required with a risk 0 
bursting the boiler which was registered for six atmospheres. 
.the results of trials with a single wheel, from rest to a velocity of 
18 kilometers an hour. 
SSSR Ge ST 
Tv, ; ; Pressure due to | Relation of additional pressure 1” 
urns per miuute. | Kil. per hour. | M tization, | the ordinary pressure on the rail 
il. "8 to 10° 3 
5lto 4 
| 
10°6 p. ¢ | 
* p. c / 
= __ 33 27s 
0 
30 | 9 
639 kil 
60 18 
