210 



Description of the Newcastle Dynamometer, 



The following diagram (Fig. 3) will perhaps assist the fore- 

 going description of the " Totalisateur." 



Fig. J. 



G The tlial-plivte, which is in constant rotary motion, its velocity being in 

 some given ratio with the velocity of the implement. 'J'his plate has 

 generally a counter connected with it, to show the space which the imple- 

 ment has traversed. 



F The disc-wheel, in contact -nnth the face of the disc-plate G : the resistance 

 of the implement, by suitable arrangements, causes the wheel, F, to move 

 from i towards/ on the face of the plate G. 



E The counter, with its dial-plates : by these the revolutions of the disc- wheel 

 are recorded. 



It would appear an easy matter to apply the instrument just 

 described to the dynamometer under consideration, as rotation 

 niight be given to the disc-plate (G, Fig. 3) by communicating- 

 machinery from the pulley A, Fig. 2 ; and a modified force of 

 resistance might be imparted to the disc-wheel F, Fig. 3, from 

 the end of the spring S, Fig. 2, in such a manner that as the 

 resistance increased the wheel would be carried from the centre 

 of the disc-plate towards its periphery, and thus fulfil the con- 

 ditions required. 



Such would be the case if equal increments of strain on the 

 rope round the pulleys A, ]\I, B, Fig. 2, caused equal deflexions 

 It is evident, however, from the table given on 



page 



of the spring S. 



