( 2 45 ) ■ 
This Experiment {hews, that the Impetus does not 
depend upon the Number of Oars, but the Number 
of Men. 
A VefTel charg’d with revolving Oars, will go as 
faft in a Calm with ioo Men, as it would do if towed 
by a Gaily of 200 Men ,* becaufe there will be one 
Gaily lefs to draw along. 
Another Memoire of Monfieur Chazelles, concerning 
the Ufefulnefs of perpendicular revolving Oars , 
invented by Monfieur Du Quet. 
The Experiment made of the New Machine , altho’ 
defedive by reafon of the Difference there was with 
tefped both to the Crew arid the Veffels, does yet 
leave room to exped a considerable Advantage from 
this Invention, in giving the Ship way : For tho’ the 
common Gaily Should keep up with the Machine Gaily 
at their firft fetting out, with equal Number of Hands ,* 
his evident, the Machine Gaily will get the better at 
long Run, when the others Crew are fo fatigu’d, as to 
be oblig’d to row by turns. For here the Men will 
hold out a longer Time, their Adion not being fo 
great, nor fo violent. Befides, having only 200 Men 
employ’d, and being equally mann’d with the other 
Gaily, frefli Hands may be Supply ’d, and fo they will 
continue to go at the fame Rate : For in cafe of need, 
the Marines may be employ’d in this Service ; which 
they will perform with as little Reludance, or Trou- 
ble, as they work at the Capflane. 
The Reafon of this Increafe of Velocity appears 
plain, if we confider the Difference between the com- 
mon 
