Templet

noun

2. To make or fit by a templet. Also template.
3. In ship-building, a skeleton framework made of thin strips of wood (or occasionally of thin sheet-metal) used to form the outline of any part, as of a plate or bar which is to be fitted to a particular place in the structure. The templet is formed and marked from the parts already erected in place; it is then taken and laid flat on the plate or bar to be used, and the outlines and rivet-holes are transferred to the plate or bar, which can then be sheared, punched, and curved so as to fit the place into which it is to go.
4. A pattern, guide, or model used to indicate the shape any piece of work is to assume when finished.
5. A strip of metal used in boiler-making, pierced with a series of holes, and serving as a guide in marking out a line of rivet-holes.