. The Philosophical magazine; a journal of theoretical, experimental and applied physics . in a suitably inclinedposition, so that the water which will be caused to rise in it bycapillary action shall occupy a sufficiently large portion of itslength. Let us procure a second tube, having, say, an internaldiameter of 3 millim., and a length of some centimetres. Let usdraw out one end of this second tube, and bend back the drawn-outthin portion so that it makes a more or less acute angle with thewide part. Let us introduce the thin portion into the upper orificeof the inclined tube till it reache
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . in a suitably inclinedposition, so that the water which will be caused to rise in it bycapillary action shall occupy a sufficiently large portion of itslength. Let us procure a second tube, having, say, an internaldiameter of 3 millim., and a length of some centimetres. Let usdraw out one end of this second tube, and bend back the drawn-outthin portion so that it makes a more or less acute angle with thewide part. Let us introduce the thin portion into the upper orificeof the inclined tube till it reaches the water contained in this, andgive to the wide portion a vertically descending position; this lastcondition will be obtained by modifying either the above-mentionedangle or the inclination of the other tube. Let us suppose that theorifice of the vertical portion does not reach the liquid of the cap-sule ; lastly, let us imagine the thin portion and the vertical tubeboth full of water. For greater clearness, I represent in section,in the annexed figure, the upper part of the a h is the inclined tube, and c d the vertical. In consequence ofthe narrowness of the space comprised between the slender portionand the inner surface of the tube a b, capillarity will maintain thewater near the orifice a of the latter; suppose that it stops at lower extremity of the tube c d not reaching the liquid of thecapsule, that tube \vith its slender portion will constitute a siphonof which the short branch dips in a liquid in equilibrium, while thelong branch descends several centimetres lower than the surface ofthat liquid. Does it not seem, then, that the water must inces-santly run through this siphon, to rejoin that in the capsule ? N^ow,if that took place, it would evidently be perpetual motion. But, the impossibility of perpetual motion being demonstrated,I asked myself what would in reality take place under the aboveconditions. I therefore requested M. Van der Mensbrugghe
Size: 1959px × 1276px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookids, bookpublisherlondontaylorfrancisetc, booksubjectphysics
