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Grow Calcite Crystals and Birefringence
https://www.jstage.jst.go.jp/article/jcersj1988/101/1169/101_1169_113/_pdf
Not exactly simple. |
26-11-2019 at 20:00
by: Twospoons |
Vacuum gauge calibration without a calibrated vacuum gauge?
[rquote=626554&tid=154449&author=Steam]You could always calibrate your vacuum gauge.... *dra ... |
21-11-2019 at 18:34
by: Twospoons |
Vacuum gauge calibration without a calibrated vacuum gauge?
I'd prefer not using mercury, if possible. I have naughty cats that like to climb about in my garage ... |
19-11-2019 at 13:43
by: Twospoons |
Vacuum gauge calibration without a calibrated vacuum gauge?
I'd love to have a Pirani gauge to go with my vacuum pump, but I can't really justify the cost. Maki ... |
18-11-2019 at 20:46
by: Twospoons |
DIY black light
Peak absorption for fluorescein is in the blue region around 470nm, and in the UV under 300nm. You d ... |
8-11-2019 at 12:30
by: Twospoons |
webcam near UV-VIS-NIR spectrophotometer(proof of concept)
I see what you mean. So the answer there is a monochromator using a ZnSe prism for dispersion, and h ... |
8-11-2019 at 02:01
by: Twospoons |
webcam near UV-VIS-NIR spectrophotometer(proof of concept)
A first surface mirror would probably be easier and cheaper, simply because building an achromat tha ... |
5-11-2019 at 13:32
by: Twospoons |
webcam near UV-VIS-NIR spectrophotometer(proof of concept)
Cooling the sensor will improve noise (kTC reset noise is a major contributor), but it wont increase ... |
4-11-2019 at 18:24
by: Twospoons |
webcam near UV-VIS-NIR spectrophotometer(proof of concept)
Hamamatsu have some nice sensors : https://www.hamamatsu.com/jp/en/product/optical-sensors/image-sen ... |
4-11-2019 at 14:38
by: Twospoons |
webcam near UV-VIS-NIR spectrophotometer(proof of concept)
The resolution in the IR seems particularly bad - I would expect an IR LED in a TV remote to be much ... |
31-10-2019 at 20:25
by: Twospoons |
Change in weight due to the moons gravity.
[rquote=624831&tid=154206&author=annaandherdad]
Tidal forces explain why the bulge of ocean ... |
23-10-2019 at 18:11
by: Twospoons |
high sensitivity low explosives
Why not use a flintlock mechanism? |
22-10-2019 at 16:42
by: Twospoons |
Making ultramarine
From Wikipedia:
[quote]
The preparation is typically made in steps: The first part of the proces ... |
13-10-2019 at 17:47
by: Twospoons |
Ebay - deals too good to be true
Its bizarre that all the other listings from this guy are the same price. Its also a bizarre range o ... |
13-10-2019 at 16:23
by: Twospoons |
Ebay - deals too good to be true
I see your point and its a good one, but I can also see how competing Ebay sellers might abuse this ... |
13-10-2019 at 13:39
by: Twospoons |
What temp is considered super heated steam and what materials will withstand these conditions?
I was referring to the pressure. Coffee is ideally brewed at 95C. But there are also single tank esp ... |
9-10-2019 at 13:02
by: Twospoons |
What temp is considered super heated steam and what materials will withstand these conditions?
I would try to use the same material throughout, no matter what you choose, otherwise galvanic corro ... |
8-10-2019 at 20:22
by: Twospoons |
Path to tin(IV) sulfide?
Even simpler you can use CaS instead of FeS. Goes by the name "Lime Sulphur" in the fungicide/bacter ... |
28-8-2019 at 21:54
by: Twospoons |
Could a thermal lance with Aluminium fuel be operated with compressed air?
Sure, but if you turn off the arc, does the steel keep burning in a stream of cold air? AFAIK you n ... |
28-8-2019 at 17:37
by: Twospoons |
Could a thermal lance with Aluminium fuel be operated with compressed air?
Given that industry is always looking for the cheapest way to do everything, if compressed air worke ... |
28-8-2019 at 14:44
by: Twospoons |
Li ion batteries same size but different capacities?
The cathode chemistry makes a big difference - it can be optimised for capacity or current delivery. ... |
31-7-2019 at 22:15
by: Twospoons |
Which number you like more: 1.99 vs 2.01?
[rquote=617281&tid=151711&author=SWIM]I really prefer 127/64ths.
Decimals bum me out.
... |
23-7-2019 at 21:36
by: Twospoons |
Night Vision Project
[rquote=617328&tid=151700&author=VSEPR_VOID]This is as much a learning extercise as it is a ... |
10-7-2019 at 15:47
by: Twospoons |
Night Vision Project
And accelerometers would be nowhere near accurate enough. Inertial systems always drift over time. |
8-7-2019 at 00:17
by: Twospoons |
Night Vision Project
Well, its the only place i've ever worked where I was wearing grade 5 ear protection while using a c ... |
7-7-2019 at 21:09
by: Twospoons |
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