Guarded Hot Box

Guarded Hot Box

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This seems to be a guarded hot box for determining the insulating properties of various materials. A brass tag on the front reads "JOHNS MANVILLE / INSULATION." Inside are two metal vials, one with a "GAERTNER" inscription. The Physics Department at Rutgers University donated this to the Museum in 1966.
Ref: Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus (A.S.T.M.).
Robert R. Zarr, “A History of Testing Heat Insulators at the National Institute of Standards and Technology,” ASHRAE Transactions 107 (2001).
Currently not on view
Object Name
insulated box
Associated Place
United States: New Jersey
lining: 23.2 cm x 12.7 cm x 14.6 cm; 9 1/8 in x 5 in x 5 3/4 in
box: 37.5 cm x 23.2 cm x 20.3 cm; 14 3/4 in x 9 1/8 in x 8 in
overall in box: 8 in x 15 in x 9 in; 20.32 cm x 38.1 cm x 22.86 cm
ID Number
catalog number
accession number
Credit Line
Gift of Rutgers University Department of Physics
See more items in
Medicine and Science: Chemistry
Data Source
National Museum of American History
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