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Published online by Cambridge University Press: 14 March 2018
On the Microscopy ListServer, a thread came up about problems with safety when loading cold traps from ladders. Working from a ladder is not a very safe proposition and being up there with a Dewar full of liquid nitrogen brings the safety officer to attention.
An alternative to trying to climb a ladder with a Dewar flask and pour the liquid nitrogen into the trap would be to have a pump for the liquid nitrogen in a Dewar flask on the ground that could be controlled from the top of a ladder.
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