306 Theory of the Pneumatic Parador. 
Experiment I]. A reservoir was made five feet high and eight 
inches square, and into one of its vertical sides, six or eight inches 
from the bottom, was set, like a pane of glass in a window, a 
square piece of tinned sheet iron, to the middle of which had 
been soldered, so as to have one end exactly even with its inner 
surface, an English smooth-drawn or triblet tube, twelve inches 
and a half long, and three eighths of an inch in diameter. This 
kind of tube was selected on account of its being, from the man- 
ner in which it is made, perfectly cylindrical. The. one used in 
this experiment, which was the longest in proportion to its diam- 
eter I could obtain in this city, had a very highly polished inte- 
rior surface, and was in every respect suited to afford exact re- 
sults. A lateral hole, one line in diameter, which was now di- 
rected upwards, had been previously made in the middle of it, 
with great care to have no protrusion on the inside, and not to 
impair in the slightest degree its cylindrical shape. ‘The outer 
end of the tube being stopped with a cork, and a strip of oiled 
silk tied over the hole, the reservoir was filled with water. On 
removing the oiled silk, a vertical jet rose to the height of forty 
seven inches. he reservoir being kept full, and the cork with- 
drawn, the water flowed through the tube, and the jet, not ceas- 
ing as in the experiment of Bossut, assumed an oblique direction, 
making an angle with the horizon of forty or forty five degrees. 
_ The greatest height it attained above the level of the tube, which 
had been previously adjusted in a horizontal position by means 
of a spirit-level, was twelve and a half inches, and the distance 
to which it was projected before descending to the same level, 
was twenty four inches. 
Experiment III. To one end of a beslo similar in every respect 
to the one used in the preceding experiment, was soldered, in ~ 
order that water flowing through might entirely fill it throughout 
its whole extent, an ajutage nearly of the form of the vena con- 
tracta. The accompanying fig- ‘Fig. 4. 
ure represents, though imper- ee 
fectly, the tube with the ajut- | ens 
age peered to a piece of tinned 
et iron, » Which was set in the 
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series 
ranged as in the preceding experiment. The end of the 
tube Sp 2 ra and the water allowed to issue through the 
ay 
