Plank
Category
Scientific instruments
Date
Unknown
Materials
Glass, Pine
Measurements
1490 mm (Length)82 mm (D)1440 mm (Length)1070 mm (Length)
Collection
Cragside, Northumberland
NT 1229610
Summary
Rough pine plank, attached with string to which are two glass tubes, one with thick glass and tiny aperture in centre, the other with very much larger central cavity, which merge into one at one end.
Provenance
Armstrong collection. Transferred by the Treasury to The National Trust in 1977 via the National Land Fund, aided by 3rd Baron Armstrong of Bamburgh and Cragside (1919 - 1987).