WITH NOTES. 499 



ing, this absence of forecast to form some strikingly 

 favourable judgment of the value of the novelty thus 

 published, although in its earliest stage, with the supe 

 rior knowledge on the subject evinced by the writings, 

 labour, and conduct of the Marquis of Worcester, at 

 least thirty-six years before Savery ; it is then, and 

 then only, perhaps, that we become fully alive to his 

 almost prescient judgment, that could, as if inspired, 

 prognosticate so truthfully as he did the future benefits 

 of his invention to mankind. 



69. 



A way how a little triangle 2 

 fcrued Key, not weighing a Shilling, 

 {hall 3 be capable and ftrong enough 

 to bolt and unbolt round about a 

 great Cheft an hundred Bolts 

 through fifty Staples, two in each, 

 with a direct contrary motion, and 

 as many more from both fides and 

 ends, and at the felf-fame time fhall 

 faflen it to a place beyond a mans 

 natural ftrength to take it away : 

 and in one and the fame turn both 

 locketh and openeth it. 



a triangle and. MS. and P. 3 not weighing a shilling - omitted. MS. and P. 



[A triangle Key.~\ This ingenious trifle may be really 

 only one part of another instrument, just as we see in 

 the cutting portion of a centre bit, which, if its operation 

 were attempted to be described after the same fashion, 

 would afford a perplexing and seemingly paradoxical 



2x2 



