Bernoulli, Daniel, Hydrodynamica, sive De viribus et motibus fluidorum commentarii

Table of Notes

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§. 20. Si tubus B C D ſit ubique ejusdem amplitudinis, ejusque lon-
gitudo
dicatur l, erit F H linea recta ipſi bd parallela, pariter atque L N:
hinc ſpatium bd N L = gl & longitudo penduli tautochroni = {l/m + n}.
§. 21. Sit B C D canalis conicus longitudinis l; erit c G (poſita bc = x)
= ({x/l}[√γ - √g] + √g)2;
unde cM = gg: ({x/l}[√γ - √g] + √g)2;
ergo ſpatium bcML = {ggl/√gγ - g} - {ggl/√γ - γg}: ({x/l}[√γ - √g] + √g) &
proinde
totum ſpatium bdN L = {ggl/√gγ - g} + {ggl/√gγ - γ} = {ggl/√gγ}:
Eſt
igitur
longitudo penduli tautochroni cum oſcillante aqua = {l√gγ/ + ng}.

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