ee 
ee ee een 
Bs 530! 4 
Fox Pee ea UN AT EOS om 
bi Buars IL 
A A view of the inftrument with the feveral parts put pay 
when ufed as a trepan. 
B ® A view of. the inftrument when intended for a trephine. 
w THE arse for thefe plates were taken by Mr. John 
Ellis from the firft made inftrument, which was executed 
with great exactnefs from my verbal inftructions by Mr. John 
/ Read, an eminent cutler and inftrument maker, of Skinner- 
row in this city. 
4 ~a” i a 
ern a tele er tes 
aay aS | 
- i 
