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The mariners' handbook; a convenient reference book for navigators, yachtsmen, and seamen of all classes (1906)

International Correspondence Schools, Roden, Ernest Konrad, 1866-, International Correspondence Schools. Pocketbook · Scranton, Pa. : International Textbook Co. · leaf 231

An illustration from The mariners' handbook; a convenient reference book for navigators, yachtsmen, and seamen of all classes, 1906, leaf 231
thegun. If both of thesethreads were continu-ous, the block couldonly be seated byscrewing it in with agreat number of turns.To avoid this, thethreads are inter-rupted, or slotted,over several sectionsof the circumference,as shown in the fig-ure. By bringing thethreaded parts ofthe plug opposite… … NAVAL ORDNANCE 199

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