Scientific Dialogues for the Instruction And Entertainment of Young People: in Which the First ...
Scientific Dialogues for the Instruction And Entertainment of Young People: in Which the First ...
Joyce, Jeremiah, 1763-1816
The book Scientific Dialogues for the Instruction And Entertainment of Young People: in Which the First ... was written by author Joyce, Jeremiah, 1763-1816 Here you can read free online of Scientific Dialogues for the Instruction And Entertainment of Young People: in Which the First ... book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Scientific Dialogues for the Instruction And Entertainment of Young People: in Which the First ... a good or bad book?
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If the height of a vessel filled with any fluid be di- ied into 26 parts, and in a given space of time, as a minute, 3 surface descend through nine of those parts, wiU it in the Kt minute descend through seven of those parts, and the rd minute five, in the fourth three, and in the fifth one? Fa. This is the law; and from it have been invented psydrcLs^ or water clocks. Ck. ^hj are they so called; and how are they constructed, pa? Fa. The term clepsydra is derived from the Greek word pmdra (*:Xf...\f/u?pa,) a word compounded of clepto (kXctttw) conceal," and hudor (u^wp) " water." Water clocks re first brought into Egypt under the reign of the olemies, and commonly used in Home during the winter kson, sun-dials superseding them in the summer. Before > invention of clocks and watches, they were very general the admeasurement of small portions of time: and the re- ftl of their use has been proposed by the late Captain ter, but adopting mercury instead of water. To construct kpsydra, take a cylindrical vessel, and, having ascertained ) time it will require to empty itself, divide the surface, by BBf into portions which are to one another as the odd mbers 1, 3, 5, 7, &c.
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