298 Mr. J. Preuss on a new Steam-Engine Governor. 



double, and it will be necessary that their speed should be 

 diminished by half, in order to restore the equilibrium be- 

 tween their centrifugal force and their weight, and a still more 

 considerable decrease of speed would be requisite to make the 

 balls collapse. Hence the speed must oscillate between the 

 maximum and the minimum ; while, in order to have an equal 

 motion of the machine, the difference between the two possible 

 extremes ought to be as small as can be. 



I have endeavoured to invent a contrivance which might not 

 be subject to the inconveniencies now stated : how far I have 

 succeeded in my task, I leave to practical engineers to decide. 

 The annexed figure shows a section of the apparatus. 



Description. 

 a. Is a water-pipe connected to a small forcing-pump, which 

 draws water, in order to supply the hot-water pan, out of 

 which the boiler is fed. This water may either be drawn 

 from the condensor or from a well. 



b. Is a small cistern supplied by the said pump. 

 (t Pipe provided with a regulating cock, through which the 



water 



