crest clearance การใช้

• Dug-in to the east, 16 RNZA had been forced to fire with minimum crest clearance over the Australian lines in order to bring effective fire to bear on the assaulting Chinese from their 25-pounders.
• In 1882, Russian Lieutenant Colonel KG Guk published " Indirect Fire for Field Artillery ", which provided a practical method of using aiming points for indirect fire by describing, " all the essentials of aiming points, crest clearance, and corrections to fire by an observer ".
• Provided that there are moderate non-negative clearances between the root and crest of the opposing threads, and everything else is ideal, if the pitch diameters of a screw and nut are exactly matched, there should be no play at all between the two as assembled, even in the presence of positive root-crest clearances.