Knott 93-235 radio micrometer
date: label: date made
content: ca 1912
name: label: maker
content: L. E. Knott Apparatus Company
notes: label: Description (Brief)
content: A black metal frame with three legs; glass enclosed cavity about half way up. Brass cap with adjustment on top. Princeton #H100. On frame: "Knott Boston / Pat Pending". There is a small square mirror set in a metal frame inside the glass that can rotate in either direction up to about 180 degrees - two stops prevent the mirror from making a complete rotation. A 4-vane device is mounted inside the top at the focus of the brass horn and is attached to the mirror. Horn can rotate to allow thermal readings to be taken from either side of the unit without interference from the experimenter. A scale and arm mechanism is missing from this specimen. Unit advertised in the 1912 Knott catalog for $15.00. Reference: page 441 - https://www.sil.si.edu/DigitalCollections/trade-literature/scientific-instruments/files/51733/imagepages/image449.htm
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Princeton University, Department of Physics, thru Frank Shoemaker
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.330594
label: catalog number
content: 330594
label: accession number
content: 299612
objectType: label: Object Name
content: Thermopile
label: Object Name
content: galvanometer
label: Other Terms
content: Thermopile; Measuring Devices
physicalDescription: label: Measurements
content: overall: 11 1/2 in x 5 3/4 in x 5 3/4 in; 29.21 cm x 14.605 cm x 14.605 cm