LS, ViU:PP, 1p, with address "Arthur S. Brockenbrough University Virginia" and ASB
docket "Sellers & Pennock Augt. 11. 1827--" The Philadelphia postmark is dated 12 August.
Above the letter Brockenbrough wrote an estimate of the cost of the hydraulion, $450 for
the engine, $120 for 200 feet of hose, for a total of $570. The LS and its cover is written on
the back of the two-page printed circular and list of prices for the hydraulion. Sellers &
Pennock's separate one-page printed circular for preserving the hose follows the list of
prices for the hydraulion.
