- Hair Hygrometer
Archive
Bib No.:
- 631867
Level:
- Item
Archive Reference:
- MET/4/3/74
Creator:
- Casella London
Date:
- No Date
Description:
- This instrument was made by Casella, based in London, and used to measure the humidity of the atmosphere. This is a recording instrument which uses a strand of human hair to work the instrument. It works on the principal the human hair increases in length with increasing relative humidity. The changes in hair length are not linear, being proportionally less at high relative humidity than at low, but the recorded changes are generally made linear by the design of the mechanism. The instrument is white with the drum, upon which the chart is positioned, is enclosed in a metal case with glass panels on three sides. The top lifts to give access so that the chart can be changed.
Media Type:
- Artefact
Language:
- N/A
Conditions Governing Access:
- Open
Conditions Governing Reproduction:
Owning Organisation:
- Met Office
Location:
- Library
Collection:
- Archive Collection
Status:
- Reference Only
Location (Room/Bay):
- Library Display Cabinet 9