The Philosophical magazine; a journal of theoretical, experimental and applied physics . s anotherinstance. The column of mercury ought to lengthen if thatinstrument registeied the absolute weight of the atmospherealone, when the column of air is loaded with vapour. The mo-tion of the vapour in the act of condensing, however, generatescurrents and produces motion of particles in a direction acrossthe column. This reduces the pressure of the column on thecistern of the barometer; and therefore the column shortensfor motion instead of lengthening for weight. Motion inmain water-pipes reduces pre
The Philosophical magazine; a journal of theoretical, experimental and applied physics . s anotherinstance. The column of mercury ought to lengthen if thatinstrument registeied the absolute weight of the atmospherealone, when the column of air is loaded with vapour. The mo-tion of the vapour in the act of condensing, however, generatescurrents and produces motion of particles in a direction acrossthe column. This reduces the pressure of the column on thecistern of the barometer; and therefore the column shortensfor motion instead of lengthening for weight. Motion inmain water-pipes reduces pressure in branches where there isno motion. Currents in motion in different directions, owing to differenttemperatures or other causes, affect the tidal currents materially. 216 Mr. A. Tylor on Tides and Waves. and prevent the tide-gauge ever registering the tidal influencesalone at any point. This is the cause of different establishmentsat neighbouring ports apparently in similar position as regardsthe luni-solar influences. Fig. I shows that the area of the gap formed when the v^ave. Lines of hcrizontalfchward motion of particles with vertical motion. Lines op vehtical motion of particles without horizontal MOTtON. Lines or horizontal backward wdtion of particles with vertical motion was generated is the limit of horizontal movement of particlesthroughout the run of that wave. Experiments show that ifwaves artificially produced for experiments continue the sameheight their velocity diminishes^ and if their height diminishesthey may keep up their velocity. It is impossible to keep upboth the velocity and height of any wave a long distance. If itwere possible it would involve perpetual motion, as the wave isresisted by the air above and by the water in which it V represent velocity of the motion of a wave measured infeet and the time (a second) in which its crest passes a fixed point,and p the depth of the water in feet; then by means of the for-mula v=Z
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