Object Record
Images
Metadata
Title |
Thermo-Hygrograph Recorder |
Object Name |
Instrument, Meteorological |
Catalog Number |
2013.005.016 |
Description |
Thermo-Hygrograph Recorder ca 1960 A Thermo-Hygrograph is a chart recorder that measures and records both temperature and humidity. Similar devices that record only one parameter are a thermograph for temperature and hygrograph for humidity. Uses a bi-metallic strip for temperature and one human hair bundle for humidity. Includes one red and blue felt –tipped pen to record the reading. A thermograph is usually configured with a pen that records temperature on a revolving cylinder. The pen is at the end of a lever that is controlled by a bi-metal strip of temperature-sensitive metal which bends as the temperature changes. Made by Belfort Instrument Company, Baltimore, MD. White label on instrument: "Property of the USDA Forest Service" Accessories to use with the instrument: Chart No 5-207-W; Ink No 10; Pen No 1-BT; Cat No 5-594; Hair No 8587PT.2; Serial No 9038 Photographed |
Date |
1960 ca |
Year Range from |
1950 |
Year Range to |
1970 |
Dimensions |
H-10 W-13.25 D-5.75 inches |
Material |
Medal / Glass / Hair |
Subjects |
Thermo-Hygrograph Recorder |
Search Terms |
Meteorology |
Catalog date |
2013-03-04 |
Collection |
National Museum of Forest Service History |