Joseph Long Hydrometer.
Category
Scientific instruments
Date
Unknown
Materials
Glass, Mercury, Paper
Measurements
190 mm (Length); 40 mm (Diameter)
Order this imageCollection
Fox Talbot Museum, Wiltshire
NT 1525281.1
Summary
Joseph Long Hydrometer. The device is glass comprising two bulbs and a stem with a marked scale reading 70-80 (units unspecified). The lower (and smaller ) bulb is half filled with mercury.
Provenance
Part of The Fenton Collection. A gift from British Film Institute in 2017. From 1986-1999, part of BFI collection for the Museum of the Moving Image. BFI purchased collection in 1986 from James Fenton's Museum of Photography, Port Erin, Isle of Man 1976-1986