A MINE SURVEYOR'S GRAPHOMETER
H. MORIN, CIRCA 1900
the lid of case stamped H.MORIN 11. Rue DULONG PARIS, the instrument housed in fitted case, with pasted instruction manual illustrating use by suspension in mines
20½in. (52cm.)
A MINE SURVEYOR'S GRAPHOMETER
H. MORIN, CIRCA 1900
the lid of case stamped H.MORIN 11. Rue DULONG PARIS, the instrument housed in fitted case, with pasted instruction manual illustrating use by suspension in mines
20½in. (52cm.)