102 Count Rumford's Inquiry , &c. 
I ig. 4. is a perspective view of the wooden box, a section 
of which is seen in the foregoing figure, (s eeg, b, i, k , fig. 3.) 
Fig- 5 an d represent the blunt borer n } joined to the iron 
bar m, to which it was fastened. 
Fig. 7 and 8. represent the same borer, with its iron bar, 
together with the piston which, in the experiments No. 2 and 
No. 3, was used to close the mouth of the hollow cylinder. 
