. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ^fgnxs /fVM ISja -rlr/? ctnfrc Fie. 225. generally, this is a very reasonable point to select, because it makes thelength of tlie engine have a minimum influence on the value ot the couple,and also causes the plane to be at about the same position in the ship, what-ever the design of the engine may be. This point is thus suited for marineengines, but for land engines it is advisable to select a point that will enablea stricter comparison to be made. This point should be at what is termed 570
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ^fgnxs /fVM ISja -rlr/? ctnfrc Fie. 225. generally, this is a very reasonable point to select, because it makes thelength of tlie engine have a minimum influence on the value ot the couple,and also causes the plane to be at about the same position in the ship, what-ever the design of the engine may be. This point is thus suited for marineengines, but for land engines it is advisable to select a point that will enablea stricter comparison to be made. This point should be at what is termed 570 MANUAL OF MARINE ENGINEERING. in theoretical mechanics the central axis of the couple. To explain this,let F = 00 be the resultant force (figs. 211a and 2116), and 0 0^ theresultant couple referred to any arbitrary plane 0 Y. Resolve the couplein and at right angles to the direction of the force F. Replace the couple Oe—that is, in the same phase plane as the force—byanother equal couple but having each of its forces equal to F. Thus Fh-Oe(figs. 211a and 2116). Then F and - F on the reference
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