26 



Dr. F. T. Trouton. An Experimental [Nov. 21, 



Fig. l. 



Plan. 



The cylinders A and B, which are mounted on steel spindles with 

 coned ends, stand vertically. One of the spindles, B, the lower in 

 the figure, is mounted on stationary bearings. The bearings of the 

 other, A, are carried by a framework which swings after the manner 

 of a gate on an axis. This axis is placed so that the cylinders may 

 come together in a line tangentially to the circle of swing of the 

 framework. This cylinder will, for shortness, be referred to as the 

 movable cylinder, the other as the fixed. 



The force pressing the cylinders together is applied by a cord 

 fastened to the end of the swinging frame, and passing over a pulley 

 to an attached weight, W. The rotation of the cylinders was main- 

 tained by chains, and toothed wheels from a driving shaft carrying a 

 pulley, C, which took a leather belt. It will be seen from the 

 diagram that the driving shaft in the apparatus used worked inside 

 the tube, which served as the pivot or axis for the swinging frame. 

 It is necessary, in transmitting rotation to the movable cylinder, 

 that care be taken that no force be introduced pressing the cylinders 

 together. This is effected in the apparatus used by placing rollers, 

 D E, carried by an independent frame near the driving shaft, in such 

 a position as to direct the line of chains through the axis of suspen- 

 sion of the swinging frame. The rollers are made adjustable, so as 

 to suit different sized cylinders. The driving power was supplied by 

 an electric motor geared down twice. The number of rotations was 

 ascertained by a counter attached to the driving shaft. 



The mo anting of a cylinder, of the substance being dealt with, on 

 its spindle is shown in Fig. 2. The diagram explains itself. The toothed 

 wheel is made to pass on and off the spindle, and is held in place by 

 a removable steel pin. In order to weigh the cylinder, the toothed 

 wheel is removed. This is necessary, on account of oil from the 

 chain. 



Results of Experiments. 



It will be seen, on examining the tables showing the results of 

 experiments made with this apparatus and given at the end of this 



