In construction you often have to deal with the internal measurements. For example, to determine the distance between the form panels, the value of the window or doorway. A good assistant in such cases would be sliding ruler, made of tube and metal rod with applied risk. V. ANTIPIN
Recommend to read
ACCORDING TO THE PROJECT OF FRIEDRICH ZANDER
25 Nov 1933 soared gird-X — the first Soviet experimental rocket with LRE (liquid rocket engine). It was created in the Gird under the direction of S. P. Korolev on the project and...
REINFORCED WING ON THE “SCHEMATICA”
Wings of schematic models of gliders do not usually have a large margin and when tightened on the guard rails inexperienced athlete fall into a flutter or fold overload! ...
