Hygrometer
date: label: date made
content: ca 1925-1950
name: label: maker
content: Davis Derby Ltd.
notes: label: Description
content: The 1901 Factory and Works Act established precise limits as to the amount of water vapor that would be allowed in British industrial settings. These limits were especially important in coal mines where some water could lessen the chance of explosions, but too much water could lead to medical problems for the miners.
label: Description
content: This hygrometer was made to measure humidity in mines, and may have been used in West Virginia. The inscription reads: "John Davis & Son (Derby) Ltd. No. 443 Derby & London. Reg No. 518758." This was an English firm that specialized in mathematical and other instruments for the mining industry.
label: Description
content: Ref.: Henry Davis, "The Application of the Hygrometer in Coal Mines," <i>Transactions of the Institute of Mining Engineers</i> 35 (1907-1908): 285-290.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, Derby
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Natural Resources
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content: Thermometers and Hygrometers
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content: Measuring & Mapping
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.321863
label: catalog number
content: 321863
label: accession number
content: 244292
objectType: label: Object Name
content: hygrometer
physicalDescription: label: Measurements
content: overall: 9 in; 22.86 cm
label: Measurements
content: overall in case: 9 1/2 in x 3 in x 3 3/8 in; 24.13 cm x 7.62 cm x 8.5725 cm