| Description | "On evidence-engines." (A short memorandum, possibly once part of a letter.)
Will it not be necessary to shew
1st the principles of the old Engines
2 those of Boulton & Watts, & the effects produced superiour to the Commoner
3 Hornblowers, that they are the same, only differently modified by using two Cyrs.
4 prove that the effects produced by their Engine is not equal to those produced by Boulton & Watts. |