The book of object lessons, a teacher's manual

The book of object lessons, a teacher's manual

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A tube (t *) with a short leg (l) filled with mercury ; a piece of glass or an iron ball floats at g, attached to a silken cord passing over a pulley ... In the marine instrument a€” the tube contracted to a very narrow bore in one part, to prevent the sudden rising and falling of the mercury ... Draw a diagram on the black-board. t If a barometer be a bad one, on swinging it in a dark room you see flashes of light, whichanbsp;...

Title:The book of object lessons, a teacher's manual
Author: W J. Lake
Publisher: - 1857

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