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Girls!
The initial choice is totally irrelevant, as one empty box will always be removed. This leaves two ... |
2-12-2004 at 13:45
by: Twospoons |
castable refractory mixtures
Voids in the cement are usually created by adding a combustible material like sawdust, then burning ... |
30-11-2004 at 13:11
by: Twospoons |
Girls!
I love it when my daughter comes to me and asks if we can do a 'science experiment'. At w ... |
17-11-2004 at 17:06
by: Twospoons |
Explosive chambers
With Al you also have the issue of Al reacting with the water.
You could also try an oil quench ... |
9-11-2004 at 18:25
by: Twospoons |
Explosive chambers
The risk of a steam explosion is probably not as great as you might think. I have poured 1/2 kg mol ... |
9-11-2004 at 15:07
by: Twospoons |
More on PbO2 electrodes
I was referring to the plating process, rather than chlorate production, though if you read through ... |
1-11-2004 at 16:09
by: Twospoons |
More on PbO2 electrodes
[quote]
Oxydro, I highly doubt any sort of rxn - remeber that Pb is more electropositive than Cu ... |
1-11-2004 at 14:07
by: Twospoons |
Carbon arc Furnace
Parallel diode arrays work better if the diodes are in close thermal contact. As diodes heat up the ... |
21-10-2004 at 17:15
by: Twospoons |
Coppercondensor again...
Typical 2-part epoxy glue turns to jelly aroung 60-70 C, but regains its hardness on cooling.
Epo ... |
20-10-2004 at 19:17
by: Twospoons |
Carbon arc Furnace
Simplicity. Robustness.
I like it! |
20-10-2004 at 13:58
by: Twospoons |
Salt Bridges, A simplification?
"Polyacrylamide" is what is written on the side of the container of water storing granules ... |
20-10-2004 at 13:52
by: Twospoons |
Salt Bridges, A simplification?
Funny, the agar idea occured to me the other day too. Though I had thought of making it into a memb ... |
19-10-2004 at 19:35
by: Twospoons |
More on PbO2 electrodes
Terracotta is a nice porous ceramic. Maybe pieces of terracotta plant pot might work. |
7-10-2004 at 19:46
by: Twospoons |
PCB etching with ferric chloride
1. Air bubbles are for agitation only, because this is simple, and gentle. I have never used air bu ... |
29-9-2004 at 16:38
by: Twospoons |
Darwin's Black Box
I always find it hysterically funny when people find something "so amazing it can't have o ... |
22-9-2004 at 20:34
by: Twospoons |
Rocketry
More accurately, the centre of pressure (CP) should be aft of the Cg. Cp is an aerodynamic function ... |
22-9-2004 at 18:26
by: Twospoons |
Crucibles and Metalcasting
Its possible it was [i]all[/i] carbonate. Did it say 'lime' (the carbonate) or 'slak ... |
16-9-2004 at 14:16
by: Twospoons |
Solvent explosions, exaggerated danger.
Diethyl ether is particularly bad as the explosion limts cover such a huge range of concentrations - ... |
16-9-2004 at 13:59
by: Twospoons |
Solvent explosions, exaggerated danger.
Your calculation is way off.
Rough calcs give me 22l of acetone vapour from 74cc of liquid aceton ... |
15-9-2004 at 18:23
by: Twospoons |
Crucibles and Metalcasting
You're right, bugger it! Should have checked my references first. Did find one addtional note ... |
13-9-2004 at 21:59
by: Twospoons |
Crucibles and Metalcasting
Use 'ball clay' instead of bentonite, if you want to increase the plasticity of your mix. ... |
13-9-2004 at 13:55
by: Twospoons |
PCB etching with ferric chloride
I'd suggest also contacting one or two PCB manufacturers, since they're the ones who actua ... |
8-9-2004 at 14:07
by: Twospoons |
PCB etching with ferric chloride
John, neither of those links appear to pertain to the discussion at hand. One is a recycler - deali ... |
7-9-2004 at 19:06
by: Twospoons |
Crucibles and Metalcasting
Bloody brilliant find Bromic! I just examined the patent, and it looks as though all thats needed i ... |
7-9-2004 at 14:18
by: Twospoons |
PCB etching with ferric chloride
I used to make up my FeCl3 solution from the solid hexahydrate. No added acids, no precipitates, an ... |
6-9-2004 at 23:20
by: Twospoons |
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