242 Mr. G. Vernon Boys on Meters for Power and Electricity. [March 2, 



of the power or work being transmitted, and the difference in the 

 distance travelled is a measure of the work done. I have here a 

 working machine which shows directly on a dial the amount of work 

 done ; this I will show in action directly. Instead of indiarubber, 

 elastic steel is used. Since the driving pulley has the velocity of the 

 tight side, and the driven of the loose side of the belt, the difference in 

 the number of their turns, if they are of equal size, will measure the 

 work. This difference I measure by differential gearing which actuates 

 a hand on a dial. I may turn the handle as fast as I please ; the 

 index does not move, for no work is being done. I may hold the 

 wheel, and produce a great driving strain ; again the index remains at 

 rest, for no work is being done. I now turn the liandle quickly, and 

 lightly touch the driven wheel with my finger. The resistance, small 

 though it is, has to be overcome ; a minute amount of work is being 

 done, the index creeps round gently. I will now put more pressure 

 on my finger, more work is being done, the index is moving faster ; 

 whether I increase the speed or the resistance the index turns faster ; 

 its rate of motion measures the power, and the distance it has moved, 

 or the number of turns, measures the work done. That this is so I 

 will show by an experiment. I will wind up in front of a scale a 

 7 lb. weight ; the hand bas turned one-third round. I will now wind a 

 28 lb. weight up the same height ; the hand has turned four-thirds 

 of a turn. There are other points of a practical nature with regard 

 to this invention which I cannot now describe. ' 



There is one other class of instruments which I have developed of 

 which time will let me say very little. The object of this class of 

 instruments is to divide the speed with which two registrations are 

 being effected, and continuously record the quotient. In the instru- 

 ment on the table two iron cones are caused to rotate in time with the 

 registrations ; a magnetized steel reel hangs on below. This reel 

 turns about, and runs up or down the cones until it finds a place at 

 which it can roll at ease. Its position at once indicates the ratio of 

 the speeds which will be efficiency, horse-power per hour, or one thing 

 in terms of another. Just as the integrators are derived from the 

 steering of an ordinary bicycle, so this instrument is derived from the 

 double steering of the " Otto " bicycle. 



Though I am afraid that I have not succeeded in the short time at 

 my disposal in making clear all the points on which I have touched, 

 yet I hoj^e that I have done something to remove the very prevalent 

 opinion that meters for power and electricity do not exist. 



[C. V. B.] 



