160 feet 69¾ lbs.
170 ” 74 ”
180 ” 78 ”
190 ” 82¼ ”
204 ” 88½ ”
The air which sustains the diver’s life below the surface is pumped from
above by a powerful pump, which must be kept constantly at work while
the diver is down. A stoppage of the pump a single instant, while the
diver is in deep water, would result in his almost instant death from
the pressure of the water outside. Only persons of perfect health and
physique can pursue the calling of a diver. It would be suicidal for a
human being not of perfect health and physique to attempt the feat.
[Illustration: THE FIRST DIVING HELMET MADE.