Details
A late 19th-Century mining air-flow meter,
by LAWRENCE & MAYO LTD LONDON, the silvered dial with five subsidiary dials, with eight-bladed fan, the brass stand and dial separated by three turned pillars -- 3 3/8in. (8.6cm.) high
by LAWRENCE & MAYO LTD LONDON, the silvered dial with five subsidiary dials, with eight-bladed fan, the brass stand and dial separated by three turned pillars -- 3 3/8in. (8.6cm.) high