Tachometer

[spbyrum]

I told my teenage daughter I had a meter that would tell how fast her
lips flapped when she talks.  I stood her under a fluorescent light in
the shop and showed her my tach reading 3600.  I then explained that if
her mouth average 1" of movement each time it moved, her lips were
running almost 35 mph.  She was instantly suspicious and wanted to know
how I did that.  I told her it was science and meters.

She was not amused when I told her the truth several days later.

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of jim ivey
Sent: Friday, October 24, 2003 7:17 PM
To: discussion at nsrca.org
Subject: Tachometer


Ok time for another thread.
I just put batteries in my tachometer and I want to calibrate it. If I
set 
it to sense a 2 blade prop and hold it to the flourescent light bulb in
the 
kitchen, what should it read. There are 120 pulses of light on 60
cycles. 
Why does it read 36. If I select a 3 blade prop it reads 23.  WHY. What 
should I set it to read looking at this light?

Jim Ivey


jivey61 at msn.com

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