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magnesium aluminate refractory up to 1800C.
You will want to remove as much sodium as possible - any residue may act as a flux.
16-1-2021 at 21:30
by: Twospoons
Help understanding DIY discharge tube emission spectrums
Also note that silicone is quite permeable to gasses.
13-1-2021 at 18:43
by: Twospoons
Radiophobia?
Do you supposed they've checked for Americium based smoke detectors yet?
11-1-2021 at 17:07
by: Twospoons
Why is there no electronic optical pyrometer ?
Out of curiosity, was it a doped wafer you tried? Doping might degrade transmission in the mid IR.
...
4-1-2021 at 19:09
by: Twospoons
Why is there no electronic optical pyrometer ?
I absolutely meant silicon, not silica. Theres a reason silicon is used as a optical material for C ...
4-1-2021 at 12:21
by: Twospoons
Why is there no electronic optical pyrometer ?
If you make the window of your furnace peephole from silicon then your optical pyrometer should work ...
3-1-2021 at 13:34
by: Twospoons
Why did TNT become so universal?
[rquote=651797&tid=156784&author=Delta-R]
Was it purely a result of it’s insensitivity an ...
21-12-2020 at 21:15
by: Twospoons
The insanity that is OHS
Thing is its much better to let kids suffer a minor injury from such simple chems, to act as a remin ...
11-12-2020 at 00:55
by: Twospoons
DIY temperature probe for hotplate, help!
[rquote=650621&tid=156587&author=p4rtridg3]After testing some LM35s I got online, I can conf ...
7-12-2020 at 14:23
by: Twospoons
Balance repair
As long as you remember that resolution and accuracy are not the same thing.
3-12-2020 at 01:48
by: Twospoons
Steel wool on hot plate for even heating??
Scrunched up aluminium foil might be better. Better heat conduction than steel wool.
30-11-2020 at 01:06
by: Twospoons
Balance repair
That circuit looks like a slightly different sensing principle. The LED appears to be regulated by f ...
25-11-2020 at 15:04
by: Twospoons
DIY temperature probe for hotplate, help!
J2 looks to be a connection for a K-type thermocouple, which means the black device next to it (TO92 ...
24-11-2020 at 19:27
by: Twospoons
DIY temperature probe for hotplate, help!
[rquote=649685&tid=156587&author=p4rtridg3]Hello all,

Testing the official external probe ...
23-11-2020 at 22:02
by: Twospoons
DIY temperature probe for hotplate, help!
Check to see if theres any bias voltage coming out of the hot plate. The cold junction sensor may no ...
23-11-2020 at 13:54
by: Twospoons
Homemade Hydrometers
[rquote=648537&tid=156495&author=yobbo II] Two decimal places of accuracy is sufficient.

...
11-11-2020 at 17:40
by: Twospoons
Covid vaccine results
[rquote=648836&tid=156509&author=macckone]
The myth that young people do not get ill is dan ...
11-11-2020 at 13:27
by: Twospoons
Covid vaccine results
The -70C storage temperature is a bit of a stumbling block though. Its going to make large scale dis ...
10-11-2020 at 17:47
by: Twospoons
Sulfuric Acid in NZ V2
There's no sulfuric acid drain cleaner sold in NZ. There are several chemical supply companies you ...
8-11-2020 at 13:26
by: Twospoons
Bad luck or what?
I recall sitting in a aircraft at Sydney Airport looking out the window, watching a baggage handler ...
3-11-2020 at 15:11
by: Twospoons
No one will give me experience, so I will make experience myself, starting from the bottom
I think OldNubbins has it dead right.
Stick to thanking them for the opportunity, politely ask for ...
3-11-2020 at 12:54
by: Twospoons
DIY Pirani vacuum pressure gauge electronics
I've always wanted to build a pirani or thermistor gauge, but I'm a little stumped by the calibratio ...
28-10-2020 at 13:13
by: Twospoons
No one will give me experience, so I will make experience myself, starting from the bottom
[rquote=646544&tid=156331&author=Cou]
If no one is gonna give me experience, I'm making it ...
15-10-2020 at 11:31
by: Twospoons
EMP device for pesky drones
https://www.up.ac.za/media/shared/Legacy/sitefiles/file/44/1026/2163/8121/electromagnetichornswithel ...
8-10-2020 at 15:05
by: Twospoons
Are Flamin' Hot Cheetos really that bad?
The artificial colours are probably the worst. I had a colleague who was allergic to at least one of ...
5-10-2020 at 21:29
by: Twospoons
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