Hi
I have been trying to find out any reference to this strange instrument. I have searched the internet without success.
I can only assume that the purpose of this instrument is for water current meter or flow measurement but I am nor sure.
As you can see in the pics, it has a propeller connected to two dials. By pulling the cord, the propeller is connected/disconnected to the gears which record the revolutions.

The instrument is signed: H. Morin 3 Rue Boursault, Paris, and is 19 inch long.

It looks like an anemometer but certainly is not for wind measurement simply because the propeller is too small and would not rotate even with stong wind.

I am aware that H. Morin is a well known French brand for antique surveying instruments and engineering instruments but I couldn’t find nothing like the one I have.
I would appreciate any help or reference to identify this instrument and also any price appraisal you may have.

Sorry, I could not upload the pics. Look my avatar.

Thanks/Ij