1 results containing "Graphite drawings--1820-1870."
[Design drawing for system to raise and lower a captive balloon, controlled by four ropes forming a pyramidal shape and operated by winches on the ground below]
[between 1820 and 1870] | 1 drawing
LOT 13401, no. 36 [P&P] | LC-DIG-ppmsca-02318 (digital file from original drawing)