[ 554 1 
but, if it gets an additional Force of 30, it will then, 
be double the Strength of 20; and, confequaitly, 
blow from a warmer to a colder Quarter. 
The Momentum of every Thing that moves, is 
made lip of Two Powers, Weight and Velocity, 
multiplied by one another. This is fully fhewn in 
the Butcher’s Stiliard, which, with a Weight of 5 
Pound, will weigh 100 Pound, by placing the 5 Pound 
Weight 20 times farther from the Centre, than the 
Thing to be weighed is placed : For 5 Pound the 
Weight multiplied by 20, the Velocity is equal to 1 00 
Pound. Suppoflng then that the Cold to the North- 
eaftof us be 100, and the Cold which drives the Trade- 
wind, only 5 ; that is, that the Cold of the one Place 
be 20 times greater than the Cold of the other: But 
fuppofing the Air 5 Degrees cold, to move 20 times 
taller than that which is 100 Degrees 5 upon this Sup- 
pofltion the Momentum will be equal : And flnce 
they move in dired Oppofltion to one another, they 
will meet exactly half way, which 1 take to be fome- 
times near the Cafe. But if the Northern Power 
fhould lofe one Half of its Weight, i. e. be milder, 
by one Half, one Winter than it is another, the other 
Power dill continuing the fame, then the South- wed: 
will blow one Half farther. 
I am aware of but one Objcdion more, which is, 
that in the Gulph of Florida , through which I fup- 
pofc the Trade-wind to flow towards us, there are 
variable Winds, which mud interrupt this Stream, if 
there be any ; flnce the fame Air cannot flow different 
Ways at the fame time. 
It is no new thing to have variable Winds near the 
Land, even in the midfl of the Way of the Trade- 
wind. 
