Rejoinder to Mr. Quinby on Crank Motion. 93 
ter; and thus all nature would become a lifeless, silent, and 
dismal ruin. On the other hand, were the heat which at 
present cherishes and enlivens this globe allowed to increase 
beyond the bounds at present prescribed to it, beside the 
destruction of all animal and vegetable life, which would be 
the immediate and inevitable consequence, the water would 
lose its present form, and assume that of an elastic vapour 
like air; the solid parts of the giobe would be melted and 
confounded together, or mixed with the air and water in 
smoke and vapour; and nature would return to the original 
chaos.” 
Arr. XI.—Remarks on Mr. Quinby’s article on Crank Mo- 
tion; tn the last number of this Journal. 
TO THE EDITOR. 
Sir, 
My reply, in one of your former numbers, to Mr. Quin- 
by, charging him with misrepresenting a passage in the 
North American Review, has drawn a long answer from that 
gentleman, which may be thought to require some notice. 
With that part of Mr. Quinby’s paper, which combats the 
opinions of the writer of the article Steam Engine, in Rees’ 
Cyclopedia, I have no concern. 1 quoted that article for its 
facts merely, and these I believe Mr. Quinby will not be 
able to overthrow. ! 
The question between Mr. Quinby and myself is very 
narrow. I! had stated that there was in the steam engine a 
loss of power, in changing the direction of its action, from 
rectilinear to rotary, as appeared from Messrs. Leans’re- 
ports of the performance of the engines used at the mines in 
Cornwall; and I further specially stated that this loss “ was 
not very satisfactorily accounted for.” Mr. Quinby having 
‘a short time after, made the very new discovery ‘‘ that the 
erank occasions no loss whatever of an acting power,” it 
suited his purpose to suppose that I attributed the loss in 
question, to the use of the crank, which is now most com- 
monly one of the agents in changing the direction of the mo- 
tion. Your readers can construe the passage in question, as 
well as Mr. Quinby, or myself; and determine whether I at- 
