What's the difference between curvimeter and opisometer?

Curvimeter

Definition:

Example Sentences:

(1) By application of of Jacobj's linear method and Lange's curvimeter-planimeter method, these approximation formulas are used to calculate the surface areas with identical semi-axis and diameter values being inserted, and the results are compared with each other and the true values.
(2) Morphological measurements were made using a microscope fitted with micrometer and camera, as well as map curvimeter.

Definition:

(n.) An instrument with a revolving wheel for measuring a curved line, as on a map.

Example Sentences:

(1) In 18 patients, the remaining small bowel length from the duodenojejunal flexure had been measured at operation and found to be less than 200 cm; this was compared with a measurement obtained by one observer using an opisometer on a subsequent barium follow-through (BaFT) examination.
(2) Twenty extracted maxillary first molars were cross sectioned every millimeter, and each section was photographed, projected and measured with a calibrated opisometer.
(3) The molars were cross-sectioned at 1-mm increments, and each section photographed, projected and measured with a calibrated opisometer.