nd with the perimeters of correspond with the altitude of the lumi- the reflector, hence the diameter of the nary. The heater is composed of rolled upper end, at the intersection of the plate iron 0.017 inch thick, and provided with head and bottom formed of non- polygonal plane, should be to that… … twice that of the secant of 17° 12', viz., and entering the face of the hub the 61° 28', determines the minimum atmos- heater may be applied and removed in pheric absorption at New York. The re- the course of five minutes, an important sult of observations conducted during a fact, as will be seen…
Engineering
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