Echelon Diffraction Grating
name: label: maker
content: Adam Hilger, Ltd.
notes: label: Description
content: This echelon diffraction grating came with the Adam Hilger, Ltd., Constant Deviation Spectrometer in the collection. The inscriptions read “ADAM HILGER LTD / LONDON, ENGLAND” and “No OF PLATES = 12 / WIDTH OF STEP 1 M/M / THICKNESS = 4.70 MM.” The form was designed by the American physicist, Albert A. Michelson, and introduced in 1898.
label: Description
content: Ref: Albert A. Michelson, “The Echelon Spectroscope,” <i>Astrophysical Journal</i> 8 (1898): 37-47; and <i>Proceedings of the American Academy of Arts and Sciences</i> 35 (1899): 111-119.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, London
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Bowdoin College
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1998.0007.04
label: catalog number
content: 1998.0007.04
label: accession number
content: 1998.0007
objectType: label: Object Name
content: spectrometer accessory
physicalDescription: label: Measurements
content: overall: 5.6 cm x 5.5 cm x 9.7 cm; 2 7/32 in x 2 5/32 in x 3 13/16 in
label: Measurements
content: overall: 2 1/2 in x 2 3/16 in x 3 13/16 in; 6.35 cm x 5.55625 cm x 9.68375 cm