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[[preprinted]] 81 [[/preprinted]]

Friday June 2 - 1882.
- at C, D.
[[image of Fig. 6 with areas labeled A through I]]
One of these springs (D) is rigidly attached to support E, and the other (C) is attached to a piece F, secured to E, by the thumb screw G.
Piece F, carrying spring C, is capable of being moved around the axis of A, and can be secured in any position by the clamping screw G.
With this arrangement the ratio between make and break is governed solely by the distance between the nearest contact points of springs C-D, and does not depend in any way upon the length of surface in contact with the wheel A.
By rotating piece F, through an angle equal to that occupied by one of the control pieces B-B etc. any desired rates can be obtained from 0 to continuous current.
By means of a graduated scale and pointer (shown at H-I, Fig 4) the apparatus can be set to give any strength of effort, from 0, to continuous amount.
The ends of C-D, are slotted as shown by the lines so as to make the springs more flexible, and give a number of separate contact points on each.
Noted by S.T. June 2 - 1882.