Page "learned" Paragraph 1273

The instrument is shown in Fig. 1 and consists essentially of a hard, sharp, tungsten carbide knife which is pushed along the substrate to remove the coating.

The force required to accomplish removal is plotted, by means of an electronic recorder, against distance of removal.

Since the removal force is a function of coating thickness, a differential transformer pickup has been incorporated into the instrument to accurately measure film thickness.

This, too, is recorded against distance by a repeat run over the same track previously cut.

A number of adjustment features are included in the Hesiometer to facilitate measurement and permit ready removal of coatings deposited on such substrates as iron and other metals, glass, wood, and plastic surfaces.

The measurement of topcoats on primers can also readily be carried out.