Sg. Shiue et al., APPARATUS FOR MEASURING THE CURVATURE OF SPHERICAL AND CYLINDRICAL SURFACES, Review of scientific instruments, 67(4), 1996, pp. 1688-1689
An apparatus, which is comprised of four equal ball feet forming a squ
are on the same plane of the support plate and a plunger in the square
and acts as a probe for determining the sagittal depth, can be used t
o measure the curvature of spherical as well as cylindrical surfaces.
(C) 1996 American Institute of Physics.