Caption: War Publications - WWI Compilation 1923 - Article 46
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a v The measured ratine in air of a 12"s shellVI °850pounds weight of y pound a " " 0 t i rot I u ult -'Son 1. •>. initial velocity, and an angle of departure of 7 ' w as 11.- KK) >d>., and the time of flight was 19.5 seconds. What would the range and time of Sight have been in vacuum? (Alger, n Ans.: A : -M097 yds., T = 22.8 seconds. (>. Vi.uneulles, in the Saint Mihicl salient in France, is about 24 miles from the German fortress of Metz. Under what angle of depart* * 2800 have to be fired at /'. to hit M. (neglecting the air resistance) ? Ans.: fi a [5*40.9', if/i = 74° 19.1'. Explain why there are two answers. Would ^1 (\f/*) have to be increased or decreased when the air resistance is taken into account ? Problems of the type given in this section will make clear to the student the mathematical background of problems dealing with "danger space" and "clearing the crest" or "firing over a mask." However, such problems are treated in Field Artillery by very simple methods of approximation and are for this reason omitted here.
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