Two direct vision spectroscopes
John Browning, mid-19th century
both lacquered brass, one dismantling into three pieces in felt-lined case, the other signed on tube John Browning London, screw-adjustable slit, with clasp fitting on to tripod stand, in fitted wooden case.
15in. (38cm.) long in case (2)
Two direct vision spectroscopes
John Browning, mid-19th century
both lacquered brass, one dismantling into three pieces in felt-lined case, the other signed on tube John Browning London, screw-adjustable slit, with clasp fitting on to tripod stand, in fitted wooden case.
15in. (38cm.) long in case (2)
.jpg?maxwidth=3840)