Object Details
- Description
- 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.
- Ref: Albert A. Michelson, “The Echelon Spectroscope,” Astrophysical Journal 8 (1898): 37-47; and Proceedings of the American Academy of Arts and Sciences 35 (1899): 111-119.
- Location
- Currently not on view
- Data Source
- National Museum of American History
- maker
- Adam Hilger, Ltd.
- Credit Line
- Bowdoin College
- Measurements
- 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
- 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
- Object Name
- spectrometer accessory
