Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional mechanic .. (1919)
Yates, Raymond F. (Raymond Francis), 1895- ed · New York, The Norman W. Henley Pub. Co. · leaf 49
riangle with the vertical angle equal to 55 degrees. Thetops and bottoms of the grooves are rounded. The Briggsthread increases or decreases in diameter in passing fromthread to thread. The thread is otherwise somethingsimilar to the AMiitworth, only the triangle is equiangularand the roundings are…
Machinery
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