Impractical. The design should pipe the compound through a
regular, small tube of reasonable dimension, then meter the
compound through an orifice at the end.
JR
Dweller in the cellar

Allan Adler wrote:

One can regard the needle of a syringe as a very thin pipe, but it is also
a very short pipe. Syringes are used in microscale organic chemistry labs
to transfer small quantities of fluids. If one wanted to avoid syringes
and instead transfer the same quantities of liquids along a pipe from a
small tank of the liquid, I imagine one would need a pipe as thin as a
syringe needle. At any rate, one can choose to do so at the design level.
(I realize there might be more resistance along the pipe and considerable
difficulty clearing a blocked pipe and possible problems due to sagging of
the pipe, but never mind.)

I have no laboratory and no shop and have no plans to actually do any of this.
I'm just thinking about how it might be done. Since the solution involves
a problem in metal work, I think it is appropriate to ask about it here.

The questions a
(1) How would one make a long metal pipe (e.g. a few feet) which is as thin
and as hollow as a syringe needle?
(2) And what if one wanted the pipe to follow some path other than straight?
Probably it is too thin to bend without closing it off, no matter how
carefully one tries to do it. Maybe one has to make miniature versions
of all of the standard plumbing fixtures and, to make sure the connections
are strong enough, one allows the outer diameters of the pipes to increase
where the threads are. So that feature of the pipe design would also have
to be included.

Ignorantly,
Allan Adler


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