A. B. Quinby on Water-Wheels. 336 
Rejoinder to the writer of the article in the North American 
Review. 
TO THE EDITOR. 
Sir, 
he reason that has caused my delay in answering the 
Rejoinder of the writer of the article in the North American 
eview, need not be stated to the public. 
The question between the writer cf the Review and my- 
self, “is very narrow.” I had stated in Vol. VIL. of this 
article in which it is stated that the crank occasions a loss of 
three-fourths of the whole power employed !!” 
I then quoted the Review, as follows: __ 
‘There is in the steam engine a loss of power in chang- 
ing the direction of its action; from rectilinear to rotary, 
the methods in common practice, not very satisfactorily ac- 
counted for, considering the magnitude of the loss, which 
on an average amounts to about three-fourths of the whole 
power, as [which] appears from the reports of the perform- 
nce 0 engines used at the mines in Cornwall.” I then 
added, that, “* With respect to the reports of the perform- 
ance of the engines used at the mines in Cornwall I had no 
knowledge, and was, therefore, not able to refer to the au- 
thority by which they were made out.” _“ Tt must, howev- 
er, be concluded, that a very great blunde? has, in some 
way, been committed by those who made the estimates, since 
the rotary motion produced by the crank, does not, in truth, 
{abstractly considered,) occasion any loss whatever of the 
acting power.” ; 
These remarks drew from the writer of the Review a Te- 
ply, charging me with ‘ misrepresentation ;’ and denying 
at, “‘ any one can pretend for one moment that there is 
any thing in his paragraph which warrants Mr. Quinby’s as- 
Sertion that the loss of power is supposed to result from the 
or, 
I then wrote a reply, and endeavored to convince the wri- 
ter of the article in question, that the paragraph I had quo- 
ted does warrant my assertion that the loss of power Is sup- 
posed to result from the crank. But this did not do. The 
writer of the Review published a rejoinder—and this I shall, 
now briefly answer. 
