Among the tools and devices for measuring the internal diameter of pipes and other cylindrical bodies is probably the most simple. Made of plywood, plastic or metal, cut an isosceles triangle with a hole of handle. On its lateral sides at the same distance from the top of the apply risks by placing near each a number corresponding to the distance between the sides of the triangle at this point. Enough to push the device top to measure the pipe until it stops — figure at this point it will show inside diameter.
Recommend to read
THE “GUARD” DOORS
The scheme is simple electronic guard device published the magazine "Funkamateur" (GDR). Across the doors of the protected object stretched thin wire. Until he is whole, the tension on...
AFRICAN “RHINOCEROS”
Developed industry of South Africa helped to create the country's advanced military industry, ranking in the global top ten by volume of its products. Enterprises of the state...
