| 摘要 |
A device for measuring the thickness of coatings comprises a rotatable drill, the cutting edge or edges of which are at a 45 DEG angle to the axis of the drill. The drill is manually operated by means of a finger disc and guided and steadied during its operation in a through-going bore in a guide plate resting with an anti-slide surface on the coated surface, the thickness of whose coating is to be determined. The conical cut made by the drill is observed in a microscope, and the width of the circular band is noted on an in-built micrometer scale. Owing to the cutting angle being 45 DEG , the said width is equal to the thickness of the coating.
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