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
AICHI D3A
The first Japanese aircraft attacked on 7 December 1941 the American naval base at pearl Harbor and dropped bombs on it, was a compact carrier-based bomber, AICHI D3A. My first flight...
START of CLASS A1
The unusual design of bearing areas — that is the main distinguishing feature of the proposed model glider. Their advantage in ease of manufacture. The absence of cut from the sheet...
