Scientific Dialogues, for Young People: in which the First Principles of Natural and Experimental Philosophy are Explained, 4. köide1815 |
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Page 12
... atmosphere on the outside . Emma . Pray explain how the air was taken away . Father . By turning the winch R half way round , I raise one of the pistons , and thereby leave a vacuum in the lower part of the barrel , and a portion of the ...
... atmosphere on the outside . Emma . Pray explain how the air was taken away . Father . By turning the winch R half way round , I raise one of the pistons , and thereby leave a vacuum in the lower part of the barrel , and a portion of the ...
Page 16
... atmosphere ; for as the little mill a turns , it is resisted only in a small degree , and will go round a much longer time than the other , which , in its revolutions , meets the air with its whole surface . By means of the spring c ...
... atmosphere ; for as the little mill a turns , it is resisted only in a small degree , and will go round a much longer time than the other , which , in its revolutions , meets the air with its whole surface . By means of the spring c ...
Page 24
... atmosphere is equal to the pres- sure of a column of water so many feet in height * . Father . And the pressure of a column of quicksilver 29 or 30 inches long , a little more or less according to the variation of the air , is equal to ...
... atmosphere is equal to the pres- sure of a column of water so many feet in height * . Father . And the pressure of a column of quicksilver 29 or 30 inches long , a little more or less according to the variation of the air , is equal to ...
Page 28
... atmosphere understood before the time of Torricelli ? Father . No : he was the father of all the modern discoveries respect- ing the properties of the atmospheric air . He died at the age of 40 , when great hopes were formed of his ta ...
... atmosphere understood before the time of Torricelli ? Father . No : he was the father of all the modern discoveries respect- ing the properties of the atmospheric air . He died at the age of 40 , when great hopes were formed of his ta ...
Page 35
... atmosphere , and the smaller one is loose , because there is no pressure on its outside to fasten it . But by admitting the air , the inner one be- comes fixed by the very means that the outer one is loosened . Emma . How will you get ...
... atmosphere , and the smaller one is loose , because there is no pressure on its outside to fasten it . But by admitting the air , the inner one be- comes fixed by the very means that the outer one is loosened . Emma . How will you get ...
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Scientific Dialogues, for Young People: In Which the First ..., 5. köide Jeremiah Joyce No preview available - 2016 |
Common terms and phrases
14 grains admit the air air is taken air rush air-pump atmosphere barometer barrel bell bladder blows body boiler boiling bottle bottom brass called catgut cause Charles cold common compressed condensed air conductor of sound consequently CONVERSATION cork degree distance duated echo effects elastic Emma Eolian equal exhaust the air experiment external air Fahrenheit fall Father feet fish fixed flask Florence flask fluid force glass hear heard heat heavier hollow earth hygrometer inches instrument lighter means mercury mercury rises miles motion move ounces piece pipe piston Plate 11 pounds pressure produced pump quantity of air quart quicksilver rain receiver red heat rise Rosneath round scale screw sound travels space specific gravity square steam steam-engine Stentor stop-cock striking suction suré surface syringe thermometer Thomas Savery thunder tion tube turn the handle vacuum valve vanes velocity vessel weather weight wind
Popular passages
Page 189 - In that case the water is kept in the tube by the pressure of the atmosphere on the surface of the water into which it is plunged.
Page 222 - ... them. Small pieces of alum and clay, mixed together, are made just large enough to enter at the wide end : they are then heated in the fire with the body whose heat is to be ascertained. The fire, according to its heat, contracts the earthy body, so that, being applied to the wide end of the gauge, jt will slide on towards the narrow end, less or more, according to the degree of heat to which it has been exposed*.
Page 180 - Soon shall thy arm, unconquered steam, afar Drag the slow barge or drive the rapid car ; Or, on wide-waving wings expanded, bear The flying chariot through the fields of air ; — Fair crews triumphant, leaning from above, Shall wave their fluttering kerchiefs as they move, Or warrior bands alarm the gaping crowd, And armies shrink beneath the shadowy cloud.
Page 248 - In foul weather, when the mercury rises much and high, and so continues for two or three days before the foul weather is quite over, then expect a continuance of fair weather to follow.
Page 247 - In fair weather, when the mercury falls much and low, and thus continues for two or three days before the rain comes, then expect a great deal of wet, and probably high winds.
Page 247 - ... 1 . The rising of the mercury presages, in general, fair weather, and its falling foul •weather, as rain, snow, high winds, and storms. When the surface of the mercury is convex, or stands higher in the middle than at the sides, it is a sign...
Page 160 - Savery to your aid ; Bade round the youth explosive Steam aspire, In gathering clouds, and wing'd the wave with fire; Bade with cold streams the quick expansion stop, And sunk the immense of vapour to a drop. Press'd by the ponderous air the piston falls Resistless, sliding through its iron walls; Quick moves the balanced beam, of giant birth, Wields his large limbs, and nodding shakes the earth.
Page 248 - ... 6. In fair weather when the mercury falls much and low, and thus continues for two or three days before the rain comes, then a deal of wet may be expected, and probably high winds.
Page 249 - In winter, spring, and autumn, the sudden falling of the mercury, and that for a large space, denotes high winds and storms ; but in summer it presages heavy showers, and often thunder.