PENNSYLVANIA CANAL.
Potts, Charles.
The canal engineer's and contractor's assis- tant, being an epitome of the theory of canal cutting; with rules for gauging water, locating curves, calculating tables, &c. illustrated by proper examples. Together with a new and exten- sive table of excavation, adapted to the dimen- sions of the Pennsylvania Canal ... By Charles Potts.
Philadelphia: William Brown,printer. 1829.
_ (See next card)
@ :