Sam Kelly on fri 5 mar 04
Hi people, can any one help with some ideas on how to make a glaze/slip
hydrometer please.
Sam
Australia
John Hesselberth on sat 6 mar 04
On Friday, March 5, 2004, at 03:52 PM, Sam Kelly wrote:
> Hi people, can any one help with some ideas on how to make a glaze/slip
> hydrometer please.
>
> Sam
> Australia
>
Hi Sam,
I suggest you don't. Measure specific gravity instead. There was a post
about 2 days ago on this very subject. You can probably find it in the
archives.
John
http://www.frogpondpottery.com
http://www.masteringglazes.com
Brad Sondahl on sat 6 mar 04
There are instructions for making one on my pottery tips page. I call
it a glaze thickness tester.
http://sondahl.com/potterytips.html
Cheap, works good enough for me.
Brad Sondahl
--
For original art, music, pottery, and literature, visit my homepage
http://sondahl.com
WHC228@AOL.COM on sat 6 mar 04
Best way is to weigh it rather than using a hygrometer.
Hygrometers are good in fluids that aren't viscous, however they aren't too
good in slip, and glaze. They tend to give a different result each time that
they are used in the same batch.
The easiest way that I have found to do this is to make your own out of a
ball flask, and the scale that you weigh your glazes with.
The reason that I use a ball flask is, that the neck is narrow, so that if
there is any error it will be minimised.
To use the ball flask you will need to make a line on the neck.
Weigh the flask while it is empty.
Weigh the flask filled with water to the line on the neck
Subtract the weight of the flask from the total wieght of the flask and water
to get the weight of the water.
The specific gravity of the slip or glaze that you are weighing is the
multiple of the weight of the water.
To use the system multiply the weight of the water that you just weighed with
the desired SG, and add the weight of theflask back in.
It sounds complicated, but once you have gone through it, it will be easy.
This is the most accurate way that I know to establish an SG.
Bill
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