That end reminds me of a closed-end thermocouple probe/sheath, though=20
7/16" is a bit large for that, but perhaps see if any thermocouple=20
manufacturer has that size sheath.  Places like omega.com and=20
blazeprobes.com .

Alternately, mcmaster.com has brass tubing also, and perhaps you might=20
find a more accurate size there.  Can you close off the end yourself=20
(solder a plate on, etc)?

Cheers,
-Neil.


On 10/25/2015 9:13 PM, David VanHorn wrote:
> I need some help sourcing the metal fitting in the picture:
> http://ecx.images-amazon.com/images/I/310e-2lm8RL._SY355_.jpg
>
> It's 7/16 OD, thin wall brass.  It matches K+S stock tubing except that t=
he
> end is rounded off and closed.
> http://www.hobbylinc.com/htm/k+s/k+s8137.htm
>
> The diameter is critical, the fitting it goes in doesn't flex much.
>
> I am not too picky on length, more than half is good, more than an inch i=
s
> a problem.
>
> A hole in the closed end is actually good, but not critical.
>
> Someone somewhere makes these things, it's probably some common thingus
> used on something I've never heard of.   Can anyone here match it up with
> something?
>
> Jewlery fittings are close, but all I've seen are too small in diameter a=
nd
> only about 1/4" long.
>
>
>
> Why:
>
> I have an antique "Violet Ray" device that I would like to make some ends
> for.  It's a rare one, which runs from 32V "farm current".  Such devices
> were made by the truckload around the turn of the century, to cure whatev=
er
> ailed you, but the vast majority are 110 or 220V for europe.  The farm
> current device is unique.
>
> I could just go buy something like in the pic, but I want to make somethi=
ng
> more like a geissler tube, which is a bit of a project.  To that end, I'v=
e
> taken up glassblowing, found a source of uranium glass, built a vacuum
> manifold and "filling station" and learned to seal off these tubes when
> under vacuum of 1-10 torr.
>
> On Ebay, there is a set of Christmas lights that are for 32V farm current=
,
> starting bid is $750 for eight lamps in a string.
> http://www.ebay.com/itm/Vintage-Christmas-Lights-Delco-Farm-32-Volt-Noma-=
4-Volt-Mazdas-Extremely-Rare-/171975314757?hash=3Ditem280a870d45:g:~rcAAOSw=
5VFWHB7f
>
> Apparently the decision for 32V went along the lines that farmers general=
ly
> suck at being electricians, so 32V isn't too bad on I^2R losses, but low
> enough for few fried farmers.  Standard 110V plugs and switches were used
> though, which could get exciting if you took your farm device and plugged
> it in on a trip to the big city.

--=20
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