Scientific Dialogues: Intended for the Instruction and Entertainment of Young People: in which the First Principles of Natural and Experimental Philosophy are Fully Explained, 2. köideJ. Grigg, T. Desilver, 1829 |
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Page 191
... known how far sound can be heard ? Father . We are assured , upon good autho- rity , that the unassisted human voice has been heard at the distance of ten or twelve miles ; namely from New to Old Gibraltar . And in the OF SOUND . 191.
... known how far sound can be heard ? Father . We are assured , upon good autho- rity , that the unassisted human voice has been heard at the distance of ten or twelve miles ; namely from New to Old Gibraltar . And in the OF SOUND . 191.
Page 192
... miles from the place of action . - In both these cases , the sound passed over water ; and it is well known that sound may be always conveyed much farther along a smooth than an uneven surface . Experiments have been instituted to ...
... miles from the place of action . - In both these cases , the sound passed over water ; and it is well known that sound may be always conveyed much farther along a smooth than an uneven surface . Experiments have been instituted to ...
Page 193
... miles from it . Emma . This I understand , because 10 miles is as nothing when compared with 12 millions . Father . Now sound travels only at the rate of about 13 miles in a minute ; therefore , as time is easily divisible into seconds ...
... miles from it . Emma . This I understand , because 10 miles is as nothing when compared with 12 millions . Father . Now sound travels only at the rate of about 13 miles in a minute ; therefore , as time is easily divisible into seconds ...
Page 194
... mile from it , and others at half a mile , and so on ; they will all see the flash or smoke at the same instant , but the report will reach them at different times . Charles . Is it certain that sounds of all ... miles . 194 PNEUMATICS .
... mile from it , and others at half a mile , and so on ; they will all see the flash or smoke at the same instant , but the report will reach them at different times . Charles . Is it certain that sounds of all ... miles . 194 PNEUMATICS .
Page 195
... miles therefore , in one pulsation sound passes over 13 miles divided by 75 , that is about 915 feet , or the 4th part of a mile , conse- quently in six pulsations it will pass over a mile . Emma . If I see a flash of lightning , and be ...
... miles therefore , in one pulsation sound passes over 13 miles divided by 75 , that is about 915 feet , or the 4th part of a mile , conse- quently in six pulsations it will pass over a mile . Emma . If I see a flash of lightning , and be ...
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Common terms and phrases
A B Plate air-pump ascend atmosphere barometer barrel bell bladder body boiling bottle bottom brass bulk Capel Lofft catgut ceiver Charles cistern cock column condensed consequently CONVERSATION copper cork cubical foot cylinder depth descend distance echo elastic Emma equal exhaust the air experiment external air Father feet filled fixed force glass gold grains greater guinea heard heat heavier than water hydrometer hydrostatics immersed inches instrument less lighter means mercury mercury rises metal miles motion move multiplied ounces particles perpendicular piece pint pipe piston pound weight pounds pres pressed pressure of fluids principle proportion pump quantity of water quicksilver rain receiver rise round scale screw side silver sink siphon small tube sound specific gravity spirits of wine square stand steam steam-engine string substance Suppose surface swim syringe taken thermometer tion upward pressure vacuum valve velocity weather weight wind wood
Popular passages
Page 234 - 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 270 - ... 1. The rising of the mercury presages, in general, fair weather, and its falling foul weather, as rain, snow, high winds, and storms.
Page 233 - The imprison'd storms through brazen nostrils roar, Fan the white flame, and fuse the sparkling ore. Here high in air the rising stream he pours To clay-built cisterns, or to lead-lined towers ; Fresh through a thousand pipes the wave distils, And thirsty cities drink the exuberant rills.
Page 239 - The mercury is sustained in the tube by the pressure of the atmosphere on the surface of the fluid in the cup.
Page 78 - He first established the truth, that a body plunged in a fluid loses as much of its weight as is equal to the weight of an equal volume of the fluid!
Page 224 - NYMPHS ! you erewhile on simmering cauldrons play'd, And call'd delighted 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 104 - I. p. 45. equal in weight to the weight of the bodies: therefore, in order that a vessel may keep above water, it is only necessary to take care that the vessel and its cargo, passengers, &c. should be of less weight than the weight of a quantity of water equal »in bulk to that part of the vessel which it will be safe to immerge in the water.
Page 175 - If the spring with which the air endeavors to expand itself when it is compressed were less than the compressing force, it would yield still farther to that force ; if it were greater, it would not have yielded so far. Therefore, when any force has compressed the air so that it remains at rest, the spring of the air arising from its elasticity can neither be greater nor less than...
Page 271 - 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 55 - Certainly: because in proportion tp the quantity drawn off, the surface descends, and consequently the perpendicular depths becomes less and less. The spaces described by the descending surface, in equal portions of time, are as the odd numbers 1, 3, 5, 7, 9, &c. taken backwards. Emma. If the height of a vessel filled with any fluid be divided into 25 parts, and in a given space of time, as a minute, the surface descend through nine of those parts, will it in the next minute descend through seven...