It will be seen
that the car here will not, with the traction circuit open, propel
itself up hill when one end of the track is raised more than 5 inches
above the table; but with the circuit energized it will readily ascend
the track as you now see it, with one end about 131/2, inches above the
other in a length of three feet, _or the equivalent of a 40 per cent.
grade_; and this could be increased still further if the motor had
power enough to propel itself against the force of gravity on a
steeper incline. As you will notice, the motor adheres very firmly to
the track and requires a considerable push to force it down this 40
per cent. grade, whereas with the traction circuit open it slips down
in very short order, notwithstanding the efforts of the driving
mechanism to propel it up.
The resistance of the helices on this model is less than two ohms, and
this will scarcely be exceeded when applied to a full sized car, the
current from two or three cells of secondary batteries being probably
sufficient to energize them.
The revolution of the driving axles and wheels is not interfered with
in the slightest, because in the former the axle boxes are outside the
path of the lines of force, and in the case of the latter because each
wheel practically forms a single pole piece, and in revolving presents
continuously a new point of contact, of the same polarity, to the
rail; the flow of the lines of force being most intense through the
lower half of the wheels, and on a perpendicular line connecting the
center of the axle with the rail.
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