recording hygrometer
Date: 1882-1891
Inventory Number: 1996-1-0236
Classification: Hygrometer
Subject:
Maker: Richard Frères (1882 - 1891)
User: George R. Agassiz Station, Harvard (1951 - 1982)
City of Use:
Dimensions:
18.2 × 29.5 × 20.8 cm (7 3/16 × 11 5/8 × 8 3/16 in.)
Accessories: brass key
Description:
A rotating brass cylinder holds recording paper; a movable stylus is in contact with the cylinder at one end and bracket holding several hairs at the other end. Recording graph paper on the cylinder is marked in units of days, hours and percent humidity. An overall hinged cover to protect cylinder and stylus swings back to allow access.
The case has a glass viewing window on the side, allowing a view of the cylinder and stylus, and a metal handle on top. The case can be secured in the closed position with two peg and hook closures on the end of the base, opposite the hinge. The whole assembly is mounted on a metal four-footed base. The instrument is painted metal, chipped and weathered.
There is a brass key.
The case has a glass viewing window on the side, allowing a view of the cylinder and stylus, and a metal handle on top. The case can be secured in the closed position with two peg and hook closures on the end of the base, opposite the hinge. The whole assembly is mounted on a metal four-footed base. The instrument is painted metal, chipped and weathered.
There is a brass key.
Signedplaque: HYGROMÈTRE ENREGISTREUR / BREVETÉ S.G.D.G. / RICHARD FRÈRES / CONSTRUCTEURS / 8 Impasse Fessart, 8 / PARIS
Inscribedplaque: HYGROMÈTRE ENREGISTREUR / BREVETÉ S.G.D.G. / RICHARD FRÈRES / CONSTRUCTEURS / 8 Impasse Fessart, 8 / PARIS
FunctionAn instrument for recording variations of the humidity of the atmosphere. The stylus responds to the change of length of the hairs, which varies with atmospheric humidity.
ProvenanceFrom Agassiz Station, Harvard, Massachusetts.