Figure 69. Buchanan sounding apparatus and water bottle. This instrument was
devised by John Buchanan for the simultaneous collection of a bottom sediment
sample and a water sample at the bottom. Schematic drawing from: Murray, J.
and Reynard, A. F., 1891. Report on the scientific results of H. M. S. Challeng
er... Deep-sea deposits, pp. 1-32. Figure 7.