This is a compound monocular with coarse and fine focus, inclination joint, circular stage, sub-stage iris diaphragm, sub-stage mirror, tri-leg base, and a Zeiss objective. The inscriptions read “John W. Sidle & Co. Lancaster, Pa. ACME” and “176” and “G. S. Woolman / AGT / N.Y.” John W. Sidle began making microscopes in Philadelphia in 1879, and moved to Lancaster in 1880. George S. Woolman, a microscope merchant in New York, was his agent for a brief period around 1880.
Sidle developed the Acme stand in conjunction with James Edwards Smith, a professor of medicine and active microscopist. Sidle described this example, an Acme No. 3, as “a good, cheap stand, which would be adapted to all kinds of work.”
Ref: John W. Sidle & Co., Condensed Price List of the ‘Acme’ Optical Goods (Lancaster, Pa., 1881), pp. 5-8.
James Edwards Smith, How to See with the Microscope (Chicago, 1880), pp. 84-92.
Currently not on view
date made
early 1880s
John W. Sidle & Co.
place made
United States: Pennsylvania, Lancaster
Physical Description
brass (overall material)
metal (overall material)
glass (overall material)
overall: 36.7 cm x 13.6 cm x 18.9 cm; 14 7/16 in x 5 3/8 in x 7 7/16 in
ID Number
accession number
catalog number
Credit Line
Estate of William Whiting
Science & Scientific Instruments
See more items in
Medicine and Science: Medicine
Science & Mathematics
Data Source
National Museum of American History


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