Contour gauge for piers
Constructing a deck on the rocky coast of Maine presents the problem of accurately and quickly cutting tube forms so that they conform to exposed, irregular bedrock surfaces. Good-looking, strong concrete piers require a leak-free contact between the form and the rock. To meet these requirements, I constructed the contour gauge shown in the drawing. Pressed against the rock and made plumb with the aid of its bull’s-eye level, the slats of the gauge can be tapped to conform to the contour of the rock, and this line can be quickly transferred by inserting the tube to be cut into the gauge, and tracing around the bottom of the movable strips. 1 built this gauge from scrap materials in a couple of hours, and it easily paid for itself in one job.
Ian R. Walker, Princeton, NJ