Figure 52. Krummel and Ruppin bottle devised by Professor Otto Krummel in 1907
and modified by Ernst Ruppin in 1912. Panel A - 3-liter bottle descending.
Panel B. 3-liter model ascending. Panel C. 1-liter bottle descending. Panel
D. 1-liter bottle ascending. This type of bottle was used by the POSEIDON