The friction
between these causes the revolution of the magnet, the winding of the
chain around the axle, and the application of the brakes. The whole of
the brakes of the train enter into action at one and the same time.
The brakes are taken off by stopping the current, and a small spring
pulls and keeps the magnet from the armatures. A frame--also
carriages--fitted with this brake, are shown by the Compagnie des
Chemins de Fer de l'Est, which company also shows several other pieces
of interesting apparatus, one of which is a carriage fitted with
elaborate mechanism, in which electricity plays, perhaps, but a
subsidiary part, to obtain the traction of the train under varying
circumstances, the pressure on the buffers when stopping, and various
phenomena connected with the engine.--_The Engineer._
* * * * *
ELECTRICITY; WHAT IT IS, AND WHAT MAY BE EXPECTED OF IT.[1]
[Footnote 1: A paper read before the Engineers' Society of
Western Pennsylvania, Nov. 15, 1881.]
By JACOB REESE
In the consideration of this subject it is not my purpose to review
the steps of discovery and development of electrical phenomena, but
the object of this paper is an effort to explain what electricity is;
and having done this, to deduce some reasonable conclusions as to what
may be expected of it.
Pages:
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89