V62 



a second toothed wheel JSf. M is about 32 mm. high, K only 

 23 mm. This is necessary because the toothed wheel A' is rigidly 

 adjusted at a fixed height, whereas M moves up and down with 

 the rod F, and therefore with the piston B in the cylindre A, for 

 so far as the cylindre A leaves room for it, i e. about 27^ cm. The 

 toothed wheels M and N must be able to engage each other at 

 every position made possible by the space left. 



By the plate turning round P, N can now be put in two 

 positions: so that its teeth catch in ^^, and so that the two toothed 

 wheels are clear of each other. When once the weights have been 

 well set rotating, N is placed in the latter position, and fixed, so 

 that the toothed wheels no longer catch into each other, and the piston B 

 therefore with the weights attached to it rotates perfectly freely, 



Fig. 3?;. 



and no other foj'ces act on it than gravity and the pressure of the 

 licpiid. N is driven by the worm R. The latter receives its motion 

 by means of a transmission with fast and loose pulleys from the 

 shaft, which is set going by the electromotor. To prevent the toothed 

 wheels from breaking, or connections from being strained when the 

 belt should be transferred from the fast to the loose pulley, the 

 toothed wheels catching into each other and the weights being in 

 strong rotation, iV^ is provided with a free-wheel S, as is also in use 

 for bicycles. It is therefore possible by setting the worm in motion, 

 to make JS' and with it M and the weights rotate, but a rotation 

 of M only sets N , and not the worm going. 



It is self-evident that the pressure indicated by the pressure balance, 



