rare 19th century antique american engineer's cast brass transit surveyor instrument with original three-legged tripod

all original and intact 19th century cast brass transit instrument with original walnut box and adjustable three-legged wood tripd. the fully functional engineer's telescopic device and tripod are in great condition with nicely aged patina consistent with age. edmund brown (1800-about 1867) spent 20 years with richard patten in new york, as an apprentice in the shop at the sign of the compass card, and then as a journeyman. in 1835, when patten withdrew from the business, brown and another employee took over the shop. in 1841, brown joined with bush g. brown, and began trading as e. brown & son. this partnership lasted until 1863.