Vindication of claims to certain inventions and
RARE Boox i ic in th hi Der, Spencer, Asa, £1.1080, ““PPOremense =a the “oo “YG -+. Vindication of claims to certain inventions
s3el and improvements in the graphic art. By Asa Spen- oned, cer.
no.7 CNew Haven? 18427]
12p. 21.5em.
Caption title.
At head of title: "Appendix to the American Journal of Science and Arts, vol.xliv, No.1."
Claiming invention of process of mechanical engraving.
| Printed buff ¢ front wrapper preserved,