94 On Massey's Soundhig Machine. 



one for a clock escapement, the other for the striking part 



of a clock *. 



The machine consists of a ro- 

 tator a formed of an air-tight 

 tube, with four vanes solidly 

 fixed to the tube, but inclined to 

 the axis of it, which inclination 

 causes the rotator to turn as it 

 passes through the water, onqe 

 in the space of five feet. Any 

 number of rotators may be re- 

 gulated to the 30th part of an 

 inch. The rotator i? attached to 

 an endless screw c, (by means 

 of an universal jomt b, and a 

 piece of line about three inches 

 long) which acts in a wheel g 

 of 24 teeth, the graduated scale 

 on the wheel being of 20 parts 

 to convert the rotations into fa- 

 thoms. An index fixed to the 

 brass plate points to the numbers 

 on the wheel as it turns round. 

 The axis of the wheel is a pinion 

 of seven leaves, that turns an- 

 other wheel on the reverse of the 

 plate of 56 teeth answering to 

 1 60 fathoms. At A is a notch 

 to hold the rotator in a hori- 

 zontal position r by one of the 

 vanes, until the machine strikes 

 the water, which immediately 

 forces the rotator into the per- 

 pendicular position a. The brass 

 plate is fixed to an iron bar mj 



• In volume xxi. of the Transactions of 

 the Society for the Encouragement of Arts, 

 Manufactures, and Commerce, a full de- 

 scription of these inventions may be found. 

 Of the striking part of a clock, for which 

 a premium of J^2l. was given, at page 

 402. And of the improvement in clock 

 escapements,, for which ^50. was awarded, 

 at page 407. Complete models of both 

 are preserved in the Society's Repository. 



about 



