Re: Neat explanation of the planimeter


"Glen Walpert" <gwalpert@xxxxxxxxxx> wrote in message
news:6h5sr2pjjmfnrnsjgk5r7tc2vsu405gtn2@xxxxxxxxxx
On Sun, 28 Jan 2007 18:08:56 -0000, "john jardine"
[...]

The one I used back in the 70's had fine grooves on the surface of the
wheel parallel to its axle, so it would slide sideways and roll
lengthwise. Useful for rough estimates on preliminary designs only
even then.

Thanks. Fine bearing surfaces and the rim lines make good mechanical
engineering sense.


I used to deal with Honeywell mechanical gas mass flow computers. Their
integrating discs were an expensive, complex marvel of mechanical
engineering but it was quite clear from watching them how the X-Y-(Z)
forces resolved. Not so with these office devices .
The planimeter site could have been vastly improved by offering up an
mpeg
of one actually in use.
john

Speaking of ancient mechanical curiosities, I recently uncovered some
old operation and calibration instructions for a Bailey pneumatic PID
controller, a "very very reliable" design from the 1940's, some of
which are still in use today. I will scan the schematic diagram and
post to ABSE for your entertainment.

Blast from the past!. Yes I'd love to see 'em.
Formative years in the 70's spent amongst petrochemical control rooms
stacked out with 3-15psi Foxboro, Taylor, Kent, Honeywell etc control gear
and some truly 'evil genius' pieces of air engineering which effected
cascade control and computing functions. Every time I programme a sqrt
routine on a PIC I think back to those massed ranks of Foxboro pneumatic
'square root extractors' and marvel as to how easy it all is nowadays.
john



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