UNPACKING
Unscrew the barometer board from the back of the packing case, lift the complete
instrument on its board out of the case and lay it on the bench, with a block 8 –
10cm high, under the cistern end.
Then remove the barometer from its board by unscrewing the top and bottom
holding screws, and place it by itself on the bench with its cistern resting on the
block.