( $ 4 ° ) 
ry fenfible.' How great foever the Weight of the Bo- 
dy be,< when once it is in Motion, it will always con- 
tinue to, if nothing hinders. 
Upon thefe, Principles, I conftder the Motion a Vef- 
fel receives by means of Oars, and the Application of 
Hands tliat fet it a-going. The Impetus of the Hand ? 
apply’d at one End of the Oar, and the Refinance the 
Water makes againft the other End, are both imprcfs’d 
upon the Point, where the Oar reds upon the Vef- 
fel. This Point is like the Fulcrum of the common 
Leaver, which always bears the Sum of the Weights 
at both Ends, betides the Weight of the Leaver it 
felf : So that the greater the Effort is at one of the 
Oars, and the Refiffance at the other, fo much the 
greater is the Impreffion, which the Point or Fulcrum 
receives, in order to its being put in Motion. A Gal- 
ley, with tw 7 o Oars only, would go as faff; as it does 
with. the ufual Number ; provided the fame Number 
of Hands were apply’d with equal Vigour to the two 
Oars, and the Oars were flrong and broad enough to 
make the neceffary, Refiffance Becaufe then the Ful- 
crum of the two Oars- would receive as much Impreff 
fion, as all the Fulcra of the common Oars taken to- 
gether. i . : 
This Confideration put me at firft upon contriving 
a Way, how to apply a greater Number of Hands to 
the common inclined Oars ; but, after feveral Tryals, 
I threw them afide, and made ufe of perpendicular 
Oars ; becaufe the firft do only skim the Water, and 
fwhen the Sea is rough, and the Waves run high) they 
don’t take Water oftentimes, and fo become ufelefs. 
For, in this Cafe, the Rowers are tript up, for want of 
meeting a Refiffance. 
d 
jj . 
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