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The two axises used on a CNC lathe are:X - CrossZ - Longitudinal
the design that is used constantly
The marine chronometer known as H1, was used to calculate a ship's longitudinal position. His design was unique as the timekeeping piece was unaffected by the change in temperature and also vessel motion. John Harrison continued to improve on his original design developing the H2, H3 and the H4. each step making the timekeeper smaller and more reliable. The H4 resembles a pocket watch
In engineering, the design to be used is the primary design. The secondary design is a backup in case the primary design is unusable for any reason.
This is a technique used by civil and mechanical engineers to calculate the cross section of a geometric figure. It is used to determine the Yield Moment also called My.