Use of cryotongs: retrieving a frozen sample from a Dewar and mounting it on a goniometer

Fill a 2 litre intermediate Dewar and a glass sample handling Dewar with liquid nitrogen
Check that you can gain access to the magnet with the cryotongs by doing a ‘dry run’ with an empty top hat in the tongs
Put the tongs in the small Dewar
Transfer the cryocane, which is holding the desired crystal from the storage Dewar or dry Dewar to the 2 litre Dewar
Place the vial holder into the small Dewar to cool down. Put on a pair of cryogloves
Lift the cryocane out of the 2 litre Dewar and take out the required vial with the other hand or with the vial tweezers
Place the vial in the vial holder (or the vial tweezers) and put them both into the small Dewar
If there is a lid on the vial, remove it using the lid opener
Place the magnetic wand in the small Dewar and wait for it to cool down
Put the wand on the top hat and withdraw it from the vial keeping the hat under the liquid nitrogen
Take the vial holder and empty the vial out of the small Dewar and put the tongs into the Dewar
When the tongs are cold (surface of the liquid nitrogen becomes calm) open them and grasp the top hat
Withdraw the wand sideways and put it down
Move the small Dewar as close to the goniometer as possible
Lift the tongs to the goniometer magnet and place the top hat base on the magnetic base
Release the tongs and carefully withdraw them
Proceed with crystal alignment