# Herreshoff Method - Half model carving - role of planimeter and book suggestion

Discussion in 'Boat Design' started by mustafaumu sarac, Mar 4, 2018.

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### mustafaumu saracSenior Member

I watched at youtube , grandson Herreshoff was talking about role of planimeter but I could not understand he was saying. Is planimeter arm used to measure things ? I really dont know .Can you help me and add to this and is there a book which only describes herreshoff method with lots of pictures and theory , if needed few books ?

umut

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### DCockeySenior Member

Planimeters measure the area enclosed by a curve. The curve is traced with the end of the planimeter arm and the area is read from the planimeter. Areas and volumes are important in boat design, and there use are discussed in most books about boat design and naval architecture.

Nathaniel Herreshoff designed his hull shapes by carving half models. Offsets were taken from the half model.

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### gonzoSenior Member

A planimeter is a mechanical integrator. It calculates the length of a curve and the area inside of a perimeter.

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### TANSLSenior Member

It is not really correct. Area enclosed by a curve, bi-dimensional and closed, is more correct. A perimeter does not delimit an area, mathematically a perimeter is a distance.

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### DCockeySenior Member

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### TANSLSenior Member

In mathematical terms (and I thought we were talking about mathematics) what I say is correct, which does not take away your reason.
In any case, speaking about the area limited by a perimeter does not seem like the correct way to refer to the area enclosed by a closed curve.

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