| abstract |
Apparatus for making glass knives for cutting specimens for viewing by optical microscopes from thin glass plates comprises the use of a breaking rule bearing against one side of a plate, at least two breaking knobs bearing against the other side of the plate on opposite sides of the breaking rule, and a scribing device arranged between the knobs to prepare a scribing line in the plate parallel with the breaking rule, the breaking rule being displaceable with respect to the scribing line to control the edge angle of the resulting knife. |