An instrument for inspecting the interior of a gun barrel and for measuring the rate of twist of the rifled bore of a firearm. The geometry of a rs a helix. Developed in 1925, in New York by John H. Fisher of the Bureau of Forensic Ballistics.

Forensic science glossary. . 2012.

Look at other dictionaries:

  • helixometer — helix·om·e·ter …   English syllables

  • helixometer — ˌ ̷ ̷ ̷ ̷ˈsäməd.ə(r) noun Etymology: helix + o + meter : a tubular instrument in which an electric light and a prism and lens system enable visual examination of a small arms bore (as in criminal investigation) …   Useful english dictionary

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