Penn Electric Switch Company Thermostat
notes: label: Description
content: Albert Penn of the Penn Electric Switch Company in Des Moines, Iowa invented this Type AA thermostat in 1928. His invention was given patent number 1,749,392 on March 4, 1930 and describes a room thermostat in which a switch is controlled by a temperature actuated bellows element to close or break a circuit that would turn on the furnace. While this design was innovative, it was not as sensitive to temperature changes as other thermostats, and the large bellows element would have jutted 4 inches out from the wall. Other thermostats were becoming smaller and more attractive, and Penn soon changed its design seen in object 2008.0011.12. While similarly styled, the thermostatic metal in the Type B worked better than the bellows, and the device protruded a mere 1.5 inches from the wall.
label: Description
content: The ubiquity of thermostats in 21st century homes shrouds the decades of innovation, industrial design, and engineering that went into making them an everyday object in almost every home. In the early 20th century, a majority of American households still heated their homes with manually operated furnaces that required a trip down to the basement and stoking the coal fired furnace. Albert Butz’s “damper-flapper” system was patented in 1886 and allowed home owner to set the thermostat to a certain temperature which would open a damper to the furnace, increasing the fire and heating the house. Progressive innovations allowed for the thermostats to use gas lines, incorporate electricity, turn on at a set time, include heating and cooling in one mechanism, and even connect to the internet.
setName: label: See more items in
content: Work and Industry: Mechanical and Civil Engineering
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content: Engineering, Building, and Architecture
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content: Thermostats
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content: Domestic Furnishings
label: Exhibition
content: Object Project
label: Exhibition Location
content: National Museum of American History
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2008.0011.14
label: accession number
content: 2008.0011
label: catalog number
content: 2008.0011.14
objectType: label: Object Name
content: thermostat
physicalDescription: label: Measurements
content: overall: 6 3/4 in x 3 1/4 in x 4 in; 17.145 cm x 8.255 cm x 10.16 cm