O.J 







'JjSa^^^!'^*^^'^!^^^^^'^'^^''^'"'^'^'' 



m 



I TT- 







Figure 37. — Henry Cheney's improvement in hammers. Patent 66298, July 2, 1867 



yfTf/^Kr) //r^yi'^y //,,^.,^ J/^/:, ^<^„,^^/^,„. ^<r^»'/^ .^ 



^ 



"V 



Figure 38. — Making metal boats. Patented by Josepli Francis. Patent 3974, March 26, 1845. 

 138 BULLETIN 24 1 : CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



