Messing around with chemistry and such, would sometimes be nice to be able
to fabricate with the glass tubes. I can bend them easy enough with just
the alcohol lamp, propane torch does even better.

I can make a poor man's condenser using a small diameter tubing for the
vapor and a larger tube for the water cooling jacket, rubber stoppers at
each end of the larger jacket tube, 2 holes in each stopper, one hole for
the vapor tube that passes through and another tube on each end for cooling
water inlet and outlet.

This could be done neater if I could weld glass nipples onto the cooling
jacket, and neck down each end of the cooling jacket and weld to the tube
that runs inside. I've been playing with the glass with a propane plumbing
torch, seems difficult to work. When trying to weld, too large of an area
of glass gets too soft, I think I need a flame that is more concentrated,
heating to melting temp right at the joint but not so much to the
surrounding glass.

Anyone here tried working with borosilicate glass with metalworking welding
torches? I don't see why it wouldn't do what I want (joining glass) but I
don't have the tanks anymore. I don't mind getting the tanks, but I would
like for it to work before I lease tanks and buy oxygen & acetylene (or
propane). When I had tanks, I had them for several years and hadn't used
half of my gasses up yet, that's why I took them back, I was paying monthly
rental on something I hardly ever used.

RogerN