Engraving upon Steel. 353 
pons XVII —Notice of Mr. Jacob Perkins's Invention of 
Engr aving upon Steel.—Eviro 
Tue heaaaeian public are already informed that Mr. 
Perkins, has given to the, before, comparatively perish- 
able labours of the engraver, a degree of paren which 
_— well vie with that of bronze or marble. 
to his well known discovery of a method of engraving 
upon aa In an interview with Mr. Rerhine, some 
, decar 
misremember) he termed "the operation. The result, at any 
rate, was to soften the steel, so that it would admit of the 
easy application of the graver. The design being 
the plate goes through another fire process, by which it is 
hardened to a high degree; and then the work becomes se 
permanent, that the plate may be passed through the rolling 
press to an almost indefinite extent, without under going any 
material wear. 
We have just received, » from Mr. Perkins, (now in in Lon- 
deta p j olar 
its of rane are tai ‘transferred to the plane of the 
h the place of aphelion 5 and at aaa also, 
slate: pars she dees ssi ie op su sGtiealti i ci 
to evince — mode of engraving is susceptible of grea 
pevetenassohe pon the margia of the plate, dere me, 
degress of ha examined. Fe small pressures, the ustal law 
the variation of balk be aS sega i that 
‘ji s 4 f ae 
eee cm snton and Ooreted, 
— Tl. is Rao . . "45 
