On Sep 15, 12:42*am, "DoN. Nichols" wrote:
On 2009-09-15, rangerssuck wrote:

On Sep 14, 4:22*pm, "Ed Huntress" wrote:
"Mark Rand" wrote in message

. ..

* * * * [ ... ]

On Mon, 14 Sep 2009 09:35:10 -0400, "Ed Huntress"

wrote:

Hey, here's something curious. I just tried this, and got funny little
drops, much smaller than I would get with an eyedropper, for example..

I took a 30-unit syringe, filled it with water, and counted the drops in 5
units. I got 11 drops -- close enough to 10 -- but they were really teeny.
These were drops that would detach themselves and free-fall as I held the
syringe point-down; just ordinary drops.

* * * * [ ... ]

Geeze, how many people here have diabetes? Show of hands?

* * * * Well ... I have a mild form at present -- controlled by pills
instead of injections.

* * * * [ ... ]

The old glass syringes were very slippery, but I don't know if they
make them in very narrow bores.

If it's too hard to control the movement of a syringe plunger, you
could use a diaphragm instead, which would have pretty close to zero
friction.

* * * * A diaphragm has the problem of giving variable delivery for a
given motion, depending on whether it is positively curved, nearly flat,
or negatively curved at the moment.

All can be compensated for - what we used to call SMOP (simple matter
of programming).


* * * * Enjoy,
* * * * * * * * DoN.

--
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