About Magazine Podcasts Events
Museum Hours

Digital Collections

Photographs

Helipot DC Tachometer

  • 1950 – 1969

Rights

Unknown Rightsholder

Download selected image

PDFSmall JPG1200 x 1494px — 235 KBFull-sized JPG1311 x 1632px — 269 KBOriginal fileTIFF — 1311 x 1632px — 6.2 MB
View
Unknown
Rightsholder
PDF
Download PDF

Tachometers measure the working speed of an engine by counting the number of revolutions per minute.

Photographer
Format
Genre
Extent
  • 4 in. W x 5 in. L
Inscription
  • (bottom front) "AH0860-1. DC Tachometer."
  • (verso) "Armstrong + Hess. 2220 East Howell Avenue, Anaheim, California 92805. Norman Armstrong - W. J. Hess. Professional Photography. 0860-1. Bus. Phone (714) 532-4424. Res. Phone: (714) 772-3427."
Subject
Rights In Copyright - Rights-holder(s) Unlocatable or Unidentifiable
Credit line
  • Courtesy of Science History Institute

Institutional location

Department
Collection
Series arrangement
  • Series X. Photographic Materials
  • Sub-series 3. Photo Albums
Physical container
  • Box 86

View collection guide View in library catalog

Related Items

Cite as

Armstrong & Hess. “Helipot DC Tachometer,” 1950–1969. Beckman Historical Collection, Box 86. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1r66j158c.

  Export citation (RIS) ?

This citation is automatically generated and may contain errors.

The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.