( 12 ? ) 
of a new Machine, which he affirms to have anfwer’d, 
in Practice, beyond any other us’d for the fame Pur- 
pofe ; fo I thought it wou’d be an Advantage to thofe 
who have Occafion for Machines, to fhew the Imper- 
fedion of fuch an Engine, when the Author of it has 
been miftaken ; thereby to prevent needlefs Expence 
and Difappointment, in ereding and trying fuch kind of 
Machines. 
Monfieur Account of his Engine is as 
follows: « In Imitation of the (modern) Crane, 
I have invented two Engines for railing Weights. 
“ The firft is made of that Organ which is the mofl: ad- 
“ yantageous of any in Mechanicks,for facilitating Mo-. 
“ tion 5 becaufe itis free from that Inconveniency which 
“ we meet with in all others • namely, the f ridion 
“ of the Parts of the Machine, which renders their 
« Motion more difficult. This Organ is the Roller, 
“ which Anjotle prefers to all other Organs, be- 
“ caufe all the others, as Wheels, Capflanes, and Pul- 
‘‘ lies, mufl neceffarily rub in fome of their Parts. 
‘‘ But the Difficulty was to apply the Roller to an 
“ Engine that raifes Weights, its Ufe having only 
“ been hitherto to caufe them to roll on an horizon- 
« tal Plane. The Engine which I propofe has a Bafe 
« A A B, (Plate I. Fig. i.) fomething like the Crane ; 
« This Bafe has in its upper Part the horizontal Pieces 
« B, which clafps an upright Shaft C O, fupported un- 
« der its Pivot C, on which the whole Engine moves in 
‘‘ the fame manner as the Crane, when the Weight is to 
‘‘ be lower’d. This Shaft fupports on itsTopacrofs 
“ Piece D D, to which are faften’d the Ropes E E, 
« which wrap round the Barrel, Axel, or Roller F, 
“ which has another Rope G, that alfo wraps or winds 
“ round 
