ji4 Mr Scott's Description of 



rature of the water in the hot well is regulated. The forcing 

 pump is wrought by the engine, and supplies the generator 

 with water from the hot welL In a side vessel that commu- 

 nicates with the hot well, there is a forcing pump wrought by 

 hand for starting the engine. Into this vessel additional water 

 enters to supply the engine, and where the height of the water 

 in the hot well is regulated. As the engine is intended to 

 work different kinds of machinery, either together or separate- 

 ly, different powers are required. 



To produce these several powers, there is a short branch from 

 the steam-pipe near the generator, that reaches to a convenient 

 place, where a steel guard safety valve is placed. On the lever 

 of this safety valve, the safety valve weight is to be hung at di- 

 Tidions marked on it answering to the power required, and a 

 corresponding length of stroke is also to be given to the for- 

 cing pump of the engine. 



The engine was first pubhcly tried in January 1828 before 

 it was connected with machinery of any kind ; but that it 

 might meet with some resistance, a friction bar of iron with a 

 considerable pressure was applied to the periphery of the fly 

 wheel, when the engine made eighty-eight double strokes per 

 minute. 



The engine was lately tried connected with grinding and 

 turning-lathe machinery, and at the same timeit wrought cast- 

 iron rollers bruising bleas for fire. Although the bleas were very 

 irregularly fed into the rollers, yet the engine continued to 

 make sixty-four double strokes per minute. A greater number 

 might have been obtained ; but from the irregular manner the 

 bleas was fed in, there was reason to fear that the main axis 

 of the engine might give way. 



On the bottom and sides of vessels that have been long used 

 for boiling fresh water, a calcareous crust is generally formed 

 more or less in thickness. 



It is proposed, if it shall be found that the spiral grooved 

 generators are liable to be incrusted in this manner, that a 

 water-tight cistern be placed somewhat higher than the genera- 

 tor. This cistern is to be connected with the upper part of the 

 generator by a pipe and stop-cock. There is also to be a branch 

 pipe from the steam-pipe close to the under part of the gene- 



