a 
~ 324 Action of Iron in motion 0%: Tempered Stee/. 
very long and apace continued, end in inventions of con- 
siderable public ut 
In reference to the sentiments expressed in this paragraph, 
Iam willing to state, that I do claim the right (in common 
with others) to set bounds to the efforts of invention. Can 
the writer of the article in the North American Review in- 
vent a right angled plane triangle, whose three angles shall 
not be equal to two right angles? Can he invent a steam- 
engine that shal! be able to impart to*the appending ma- 
chinery more power than is applied? It is now established 
that all double stroke engines do impart to the appending 
machinery all the power that is applied, and consequently a 
saving of power can only be effected by the invention of a 
aehing that shall impart more power than is applied to it; 
and this, in the judgment of the writer of this reply, is not 
possible. 
A; B. QUINBY. 
New-York, Nov. 1, 1824: 
Note. In my note to my demonstration of the Crank 
Problem; | wrote the words, “ reciprocating motion produced 
by the crank.” ‘This is an error. It should be, rotary mo- 
tion produced by the crank, 
A: B. Q. 
Aer. XVI.—On the action of Iron in motion on —— 
Steel. By MM. Danser and Cottanon 
Tue mannef in which steel is cut by soft iron, as ascer- 
iained by Mr. Barnes, has been pointed out, p. 155 of our 
last volume ; and since then the effect has bet attributed to 
the softening of the steel at the point of contact by the heat 
resulting from the friction. The following experiments and re- 
sults, in relation to this subject, are extracted from a mémoire 
published in the Bib, Univ. xxv. p. 283 
e authors of the paper were led to doubt the sufficiency 
bf the reason above given, by finding, on an exarnination of 
*he iron plate made use of to cut some steel, that its edge 
_ # From thé London Quarterly Journal for October 1824. 
