356 Mr, Nixon's Theory of the Spirit-Levcl. 



mersed in water, a portion of the water rises immediately 

 around them with a curved surface about 0*1 in. above its na- 



tural level. (2). If two vertical cylinders or two plates of 

 glass be brought nearly in contact, the water will ascend 

 higher between them than on the opposite or other sides. 

 (3). On inclining a plate or cylinder of glass, the water un- 

 der the overhanging side of either will rise to a greater per- 

 pendicular height than when they are vertical ; but on the op- 

 posite side the elevation will be so much diminished as to be 

 nearly insensible. (4). When two plates of glass, inclined to 

 each other, are immersed in water with the line of their inter- 

 section vertical, the water will ascend between them, and form 

 a hyperbola. (5). One end of a vertical tube having a bore 

 of 0*5 inch being immersed in water, the water immediately 

 surrounding its exterior appeared to stand as much above its 

 natural level as within the tube. (6). But when capillary tubes, 

 that is, those of which the bore did not exceed 0*1 inch, were 

 made use of, the water within the tubes stood with a concave 

 surface at a much greater height than on the outside ; the 

 discrepancy augmenting nearly as the bore of the tubes di- 

 minished. (7). Within a tube the ascent of the water, on ac- 

 count of the quantity of attracting zone being nearly double 

 that of two vertical plates placed at a distance from each other 

 equal to the diameter of the tube, is about double its eleva- 

 tion between the plates. (8). For the same reason the ver- 

 tical height of the water within the half-inch tube when in- 

 clined, was greater on that interior side of it overhanging 

 the water within, than on the corresponding exterior side 

 (9). On drawing the same tube horizontally out of the water, 

 it continued to be filled exclusively with that fluid, even when 

 its interior upper surface was elevated nearly O'l inch above 

 the general level. (10). This was equally the case when 

 either end of the tube was submerged in, and the other stood 

 out of the water not more than 0*1 inch. (11). On raising 

 either end of the tube more than this height out of the water, 

 the air began to intrude, impressing on the fluid the curved 

 form exhibited in the figure. (12). The tube being subsequently 



held 



