"N_Cook" wrote in message
news
I forgot to say , note the fusee compensator cone on the axis of the
lower pulley. This takes/supplies the perforated tape, winding around
that pulley. The fusee offesetting the varying weight of the
suspension band. Also the large float about 2ft 6 in diameter is
shown on the floor. The suspension must cope with the possibility of
that float puncturing, filling with water, and jamming unsupported by
seawater.
Other models of the same make used a simple wire suspension and
returning the counterweight down the sampling well, which then
transfered silt and slime onot the recorder, not the case with the
type pictured.
2 inches on the traverse represents 2 foot of water level change, 1
in to 1 foot scaling in the gear train.


The instrument appears custom made on general-purpose machine tools,
in which case the hole spacing could be whatever the maker's rotary
indexing machinery permitted, and the tape then punched or drilled to
match. The number of pins has to be an integer but the arc length
between them doesn't.

Can you reconstruct the circumference of the wheels?
-jsw