Apparatus for fetching water from any depth of the sea

A diagram illustrating apparatus designed by Robert Hooke to fetch samples of water from any depth of the sea using a wooden bucket with a lid that remains open while the bucket descends but closes when it begins to be drawn back up to the surface. The red chalk part of the diagram shows the first state of the apparatus as it is in operation and the grey wash part shows the second state.

The design was discussed at the meeting of the Royal Society on 30 September 1663, and was also entered into the Society's Register Book (RBO/2i/302,RBO/2ii/203r). The paper and the figure were printed in Philosophical Transactions, vol. 1 no. 9 (February 1666) and again in vol. 2 no. 24 (April 1667).