Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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which may be made in little, in great, or in very great; of
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which I make uſe frequently, to the admiration of ſuch as ſee it.</
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>I prepared an hundred Siphons, or, if you will, bowed Pipes,
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all equal; and placed them at the brim of a Veſſel, wherein the
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water is kept at one and the ſame level (whether all the Syphons
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work, or but a certain number of them) the mouths by which
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the water iſſueth being all placed in the ſame level, parallel to
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the Horizon; but lower in level than the water in the Veſſel; and
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gathered all the water falling from the Syphons into another
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Veſſel ſtanding lower than the former, I made it to run away
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thorow a Chanel, in ſuch manner inclined, that wanting water
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from the Syphons, the ſaid Chanel remained quite dry.</
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>And this done, I meaſured the quick height of the Chanel
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with care, and afterwards divided it exactly into 10 equal parts,
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and cauſing 19. of thoſe Syphons to be taken away, ſo that the
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Chanel did not run water, ſave onely with 81 of thoſe Syphons,
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I again obſerved the quick height of the water in the ſame ſite
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obſerved before, and found that its height was diminiſhed pre
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ciſely the tenth part of all its firſt height; and thus continuing to
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take away 17. other Syphons, the height was likewiſe diminiſh
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ed 1/1. of all its firſt quick height; and trying to take away 15.
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Syphons, then 13, then 11, then 9, then 7, then 5, and then 3.
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alwaies in theſe diverſions, made in order as hath been ſaid, there
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enſued ſtill an abatement of 1/1. of the whole height.</
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>And here was one thing worthy of obſervation, that the water
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encreaſing in [
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or through
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] the Chanel, its quick height was diffe
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rent in different ſites of the Chanel, that is ſtill leſſer, the more
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one approached to the Out-let; notwithſtanding which the abate
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ment followed in all places proportionably, that is in all its ſites
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the firſt part of the height of that ſite diminiſhed: And more
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over the water iſſued from the Chanel, and dilated into a broader
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courſe, from which likewiſe having divers Out-lets and Mouths;
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yet nevertheleſs in that breadth alſo the quick heights ſucceſſive
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ly varied and altered in the ſame proportions. </
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>Nor did I here
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deſiſt my obſervation, but the water being diminiſhed, that iſſu
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ed from the Syphons, and there being but one of them left that
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diſcharged water; I obſerved the quick height that it made in the
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above-ſaid ſites, (the which was likewiſe 1/1. of all the firſt height)
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there being added to the water of that Syphon, the water of
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three other Syphons; ſo that all the water was of 4 Syphons,
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and conſequently quadruple to the firſt Syphon; but the quick
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height was onely double, and adding five Siphons, the quick
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height became triple, and with adding ſeven Syphons, the height
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increaſed quadruple; and ſo by adding of 9. it increaſed quin
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tuple, and by adding of 11. it increaſed ſextuple, and by ad</
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