17H 
DR. :\j. w. trayp:rs, mr. (r sexter, and dr. a. jaquerod 
employing liquid and a pump. The compression tube is shown in fig. G. The 
wider jiortion, A, which was made of boiler-gauge tube, had an internal diameter 
of G milli.ms,, and was capable ol‘ standing a pressure ot SO atmospheres, or more. 
At its lowei' end it entered the steel conipression apparatus, and at the top it was 
