spherometer

[ sfi-rom-i-ter ]

/ sfɪˈrɒm ɪ tər /

an instrument for measuring the curvature of spheres and curved surfaces.

Origin of spherometer

1820–30; < French sphéromètre; see sphero-, -meter

Before the grade of emery is changed all three surfaces must agree, as nearly, at least, as the spherometer will show.

On Laboratory Arts |Richard Threlfall
The spherometer is accepted as the sole guide in obtaining the proper curvature.

On Laboratory Arts |Richard Threlfall
It is well to control this process by means of a spherometer, so that the desired radius may be approximately reached.

On Laboratory Arts |Richard Threlfall
The squares of glass are cemented to the roughing tool, and this is ground to the spherometer by means of the counterpart tool.

On Laboratory Arts |Richard Threlfall

The glass is ground with emery to the correct spherical figure as given by a spherometer.

On Laboratory Arts |Richard Threlfall

spherometer

/ (sfɪəˈrɒmɪtə) /

an instrument for measuring the curvature of a surface