Hand spectroscope

 

John Browning, London
Large straight-hand spectroscope (length 15 cm) made of ZAPON lacquered and blackened brass with an adjustable gap and 5 prisms; the arm is mounted on a side-mounted milled wheel and a lever connected to it. In its blue plush-lined leather covered case.
Signed “JOHN BROWNING | 63, STRAND LONDON”, and "GRACE'S SPECTROSCOPE” at the other side. Originally designed for meteorological use.

private collection

Hand spectroscope, John Browning, London

Hand spectroscope, John Browning, London

Hand spectroscope, John Browning, London