Abstract: A sectional form measuring apparatus measures perfect sectional forms of an object to be measured. The apparatus comprises a plurality of detectors for receiving reflected lights from the surface of an object, and a plurality of optical fibers with focusing lenses and light sources mounted on opposite ends thereof, or the like for measuring distances from a reference axis to the surface of the object to obtain the sectional forms at a plurality of positions on the reference axis. A marker may be applied to a specified measuring position on the surface of the object, thereby indicating a surface form of the measured object.

Abstract: A hot-wire flowmeter includes a hot wire heated pulsatively for heating a fluid being measured, and a thermosensitive detector located downstream of the hot wire for detecting the heated fluid. The hot wire is heated again in response to an output signal from the detector with the result that the hot wire is periodically heated at a rate that is dependent on the speed of flow of the fluid. The rate of flow of the fluid can be derived from the rate at which the hot wire is periodically heated.