chronometric radiosonde
Dateca. 1920-1937
Inventory Number1998-1-0842
ClassificationRadiosonde
Subject
Maker
Blue Hill Meteorological Observatory
1885-present
Cultural Region
Place of Origin
Dimensions14 x 28 x 6 cm (5 1/2 x 11 x 2 3/8 in.)
Material
Bibliography
DescriptionAn early radiosonde, likely that known as a "Radio-Meteorograph Type-L," for transmitting atmospheric data. The type consists of a contact dial,an aneroid and a bimetallic thermometer.
Etched on the thin metal dial is a scale of equally spaced radial lines (worn away in this instrument), which is an altimeter. The forty thin lines are bare metal, while the intervals between them are nonconducting material. The aneroid moves a shaft with a fine pen arm, which slides over the dial divisions, closing an electrical circuit when bare metal is contacted, thus transmitting pressure change data.
The barograph is connected to a radio transmitter. A bimetal thermometer is also included.
Etched on the thin metal dial is a scale of equally spaced radial lines (worn away in this instrument), which is an altimeter. The forty thin lines are bare metal, while the intervals between them are nonconducting material. The aneroid moves a shaft with a fine pen arm, which slides over the dial divisions, closing an electrical circuit when bare metal is contacted, thus transmitting pressure change data.
The barograph is connected to a radio transmitter. A bimetal thermometer is also included.
Signedunsigned
Inscribedpaper tag on the back, probably for battery: Patent under 1,292,764, 1,307,868, 1,331,877
FunctionAn early instrument for transmitting atmospheric data.
ProvenanceBlue Hill Meteorological Observatory
Feiber Instrument Company
Date: ca. 1930-1936
Object number: 1998-1-0873
Feiber Instrument Company
Date: ca. 1930-1936
Object number: 1998-1-0872a
Blue Hill Meteorological Observatory
Date: ca. 1920-1940
Object number: 1998-1-0829
Feiber Instrument Company
Date: mid 20th Century
Accessories: see Curatorial Remarks
Object number: 1998-1-0820
Friez Instrument Division, Bendix Aviation Corporation
Date: 1943-1950
Accessories: lid; stack of aerograph paper; metal case
Object number: DW0446
Davis & Son
Date: 1843-1873
Accessories: small metal key
Object number: 1998-1-0606
Blue Hill Meteorological Observatory
Date: ca. 1935-1945
Accessories: card with instrument info
Object number: 1998-1-0875