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- Newsgroups: rec.models.rc
- Path: sparky!uunet!panther!mothost!white!rtsg.mot.com!svoboda
- From: svoboda@rtsg.mot.com (David Svoboda)
- Subject: Re: Tachometers
- Message-ID: <1993Jan25.212821.9167@rtsg.mot.com>
- Sender: news@rtsg.mot.com
- Nntp-Posting-Host: guppie44
- Organization: Motorola Inc., Cellular Infrastructure Group
- References: <727557080snz@harrier.demon.co.uk> <LARRY.93Jan23223639@peak.psl.nmsu.edu> <C1E85w.Grr@usenet.ucs.indiana.edu>
- Date: Mon, 25 Jan 1993 21:28:21 GMT
- Lines: 16
-
- In article <C1E85w.Grr@usenet.ucs.indiana.edu> ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
- |
- |I've seen the contact tachometers in science catalogs but they're
- |always in the $200-500 range. Not quite the hobby item methinks..
- |more like something you'd use for making sure one's record player
- |is always at 33 1/3 rpm...
-
- I remember a simple mechanical tachometer I saw once when I was younger.
- It consisted of a small sliding wire in a little tube. You held the tiny
- device against the head of your running engine and adjusted the length of
- the wire until it achieved maximum resonance (vibrated back and forth the
- farthest), then held it up and read the rpm off of the markings on the
- side of the wire. No good for seeing variation, but it couldn't have cost
- more than a few bucks, and certainly fulfilled the KISS principle.
-
- Dave Svoboda, Palatine, IL
-