richard2

Hi guys,

I know this is not pyrotechnics but it is still possibly of interest to some of you.

I have recently been playing around with some liquid nitrogen doing some demos and trying to get friends interested in practical science. During which I have done a little research into the Leidenfrost effect (the reason you can dip your hand in LN2 and not burn/freeze yourself). While doing so I have come across a few accounts of people dipping 'WET' fingers into molten lead. For a few reasons this seems absolutely insane to me however it does demonstrate the same principle and would be fairly impressive.

I would like to know if anyone has been mad enough to try this and if so did you remain uninjured?

Another thought I have had about this is that some of the lower melting point alloys that have been heated enough not to solidify on contact with your skin but to above waters Leidenfrost point may provide more room for error. Any comments on this or suggestions of appropriate alloys/metals would be appreciated.


On a completely different note I have attempted to find the thread that this was posted in but have not been successful. I am considering purchasing the CR2 rock tumbler from Manchester Minerals however have a few questions. I know that a few members have one of these and would like to know the diameter of the jars and length of both the 1400g and 800g size jars. The reason I ask is I am a little concerned with the amount of media that these will hold (especially the larger one). If these are filled half way with lead media do they exceed the 2800g max recommended for the tumbler? I also realise that these run at a lower than optimal speed for the media I would be using (1/2 inch) so has anyone tried lift bars in these jars and how effective at reducing milling time were they? Also from what I have seen in the past the maximum capacity of similar tumblers tends to be rated on the jar size. Does anyone have a CR1 and if so what are the motor specs (CR2 specs would also be useful). I ask only because I would likely only run one jar at a time and if this was going to be a heavy jar then shorter rollers with the same motor would be more likely to last.

Thankyou in advance for any advice.

Regards


Rich