"In the middle of a large room stood an oak tub, four or five feet in diameter and one foot deep. It was closed by a lid made in two pieces,and encased in another tub or bucket. At the bottom of the tub a number of bottles were laid in convergent rows, so that the neck of each bottle turned towards the centre. Other bottles filled with hypnotized water tightly corked up were laid in divergent rows with their necks turned outwards.
Several rows were thus piled up, and the apparatus was then pronounced to be at 'high pressure'. The tub was filled with water, to which were sometimes added powdered glass and iron filings. There were also some dry tubs, that is, prepared in the same manner, but without any additional water.
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