Maximum Thermometer
date: label: date made
content: after 1890
name: label: maker
content: H. J. Green
notes: label: Description
content: Mercury-in-glass thermometer designed so that an air bubble separates a small bit of mercury from the main part of the column. When the temperature falls, the detached mercury remains in place indicating the maximum temperature attained, until reset by the observer. John Phillips, an English geologist, introduced the form at the 1832 meeting of the British Association for the Advancement of Science. In 1856 he showed an improved form made by Louis P. Casella of London.
label: Description
content: Appleton's <i>Encyclopaedia</i> noted in 1860 that James Green of New York "appears to have removed the objections to the previous forms of the maximum thermometers, and produced a highly simple and perfect instrument." Henry J. Green, who was James Green's nephew and successor, also made instruments of this sort. This example has a grooved aluminum plate that is marked "H. J. GREEN B'KLYN. N.Y." and "No. 12701 U.S. WEATHER BUREAU" and "MAXIMUM" and is graduated every 5 degrees Centigrade [?] from -25 to +55 degrees. The bulb is spherical. The stem is marked "U.S. 12701" and graduated every degree from -29 to +57.
label: Description
content: Ref.: Henry J. Green, <i>Meteorological and Scientific Instruments</i> (Brooklyn, 1900), p. 22.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Brooklyn
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Thermometers and Hygrometers
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Weather Bureau
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.317474
label: accession number
content: 230396
label: catalog number
content: 317474
objectType: label: Object Name
content: thermometer
physicalDescription: label: Measurements
content: plate: 12 in; 30.48 cm
label: Measurements
content: tube: 10 in; 25.4 cm
label: Measurements
content: overall: 12 1/8 in x 15/16 in x 1/2 in; 30.7975 cm x 2.38125 cm x 1.27 cm