Popular science monthly . ached to it bylight wires is a plate which byits pull offers still furtherresistance to the air exhibition of the sup-porting power of an air-jetwas given in AgriculturalHall, London, and the fanused was an ordinary centrif-ugal high-pressure blowerwith a si.\-inch diameter out-let at the extreme end of thenozzle. The phenomenon is ex-plained in the following man-ner; The jet issuing from thenozzle spread out into a cone-shaped formation on beingmd the ball was held in theThe high-pressure jet released, center of this cone. acting upon the surface of the
Popular science monthly . ached to it bylight wires is a plate which byits pull offers still furtherresistance to the air exhibition of the sup-porting power of an air-jetwas given in AgriculturalHall, London, and the fanused was an ordinary centrif-ugal high-pressure blowerwith a si.\-inch diameter out-let at the extreme end of thenozzle. The phenomenon is ex-plained in the following man-ner; The jet issuing from thenozzle spread out into a cone-shaped formation on beingmd the ball was held in theThe high-pressure jet released, center of this cone. acting upon the surface of the ball, caused a slight upward reaction which tended to maintain the ball in the air. It will be seen that the ball is in the centerof the jet and not on the edge of it. Thisis in contradistinction to the theor\- thatthe object is suspended b\- with theouter strata of air in the jet. The ball is heldalmost |>erfectl\ at rest in the air-current. The ball is held suspended in thecenter of a cone-shaped air-current. Popular Science Monthly 871 How Mans Eyes Differ from Thoseof the Animals ASIDE from the niDiikoy, man is theonly animal lia\ing what we callbinocular single vision. That is, he can tellnot only the direction of an object, but hecan estimate lairh accurately its is because both of his eyes point at thesame object at the same time, like two rangefinders. Other animals do not concentratetheir gaze in this way. Their eyes are setmore nearly at the sides of the head so thatthey see not only forward but backward fora short distance. Man, on the contrary,sees clearly only the object at which helooks directly. Using a Tree as a Mast for aWireless Station THE ceiba tree is the largest specimenof the vegetable kingdom growing inCentral America. The city of La Ceiba,chief among the settlements on the Carib-bean coast of Central America, was givenits name because a huge ceiba tree standingnear the beach was a landmark for mariners. Anotlier of these huge t
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
