Disc system for comparing surface samples - has circular interlocked discs, each of which includes operating lip for rotating disc with reference to other disc or discs

摘要

The system has two or more discs (1). Each disc has a radial cut-out (2). Each disc has an operating lip (3) for rotating the disc with reference to the other disc or discs. Each disc has a scale (4) around its circumference. The scale can be numbered sectors, percentage sectors or other text appropriate to the use.