🚀 go-pugleaf

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