Scientific Dialogues for the Instruction and Entertainment of Young People: In which the First Principles of Natural and Experimental Philosophy are Fully Explained and Illustrated

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continued
255
Hydrometer
259
Swimming
264
Syphon
268
Diving Bell
273
Diving Bell continued
276
Pumps
278
Forcing Pump Fire Engine Rope Pomp and Hydraulic Press
282
Definitions in Hydrostatics
286
Conversation PagoI Nature of Air
288
Air pump
291
Torricellian Experiment
296
Pressure of the Air
298
Pressure of the Air continued
301
Weight of Air
305
Elasticity of Air
308
Compression of Air
314
Miscellaneous Experiments on the Airpump
318
Airgun and Sound
321
Sound
327
Speaking Trumpet
333
Echo
336
Echo continued
340
Winds
343
Steamengine 330
350
Steamengine continued
355
Steamengine continued and Papins Digester
357
Barometer
363
Barometer and its application to the Measuring of Altitudes
367
Thermometer
371
Thermometer continued
375
Pyrometer and Hygrometer
379
Definitions in Pneumatics
386
Lightthe smallness of its particlestheir velocity they move only in straight lines
388
Rays of LightReflection 393 III Refraction of Light 396 IV Reflection and Refraction of Light 4U0 V DefinitionsDifferent kinds of LensesMr Parker...
404
Parallel Diverging and Converging RaysThe Focus and Focal Distances 409 VII Images of Objects inverted Scioptrie BallLenses and their Foci 412 V...
416
Colours
418
a Reflected Light and Plane Mirrors
421
Concave MirrorsTheir Uses and mode of Action
425
Concave Mirrors and Experiments on them 428 XIII Concave and Convex Mirrors
430
MAGNETISM
472
Variation of the Compass
480
VI1L The Leyden JarLanes Discharging Electrometer
510
Galvanism II Galvanic or Voltaic Light and Shocks
547
Electromagnetism Diamagnetism Double Refrac
557
Glossal? and Lsdex
567

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الصفحة 423 - ... as the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
الصفحة 142 - evidence of things not seen," in the fulness of Divine grace ; and was profound on this, the greatest concern of human life, while unable even to comprehend how the " inclination of the earth's axis to the plane of its orbit" could be the cause of the change of the seasons.
الصفحة 176 - Venus a pea, on a circle of 284 feet in diameter ; the Earth also a pea, on a circle of 430 feet ; Mars a rather large pin's head, on a circle of 654 feet ; the Asteroids, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across...
الصفحة 176 - Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile; Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half, and Neptune a good-sized plum on a circle about two miles and a half in diameter.
الصفحة 361 - The mercury is sustained in the tube by the pressure of the atmosphere on the surface of the fluid in the cup.
الصفحة 98 - To ask or search I blame thee not ; for Heaven Is as the Book of God before thee set, Wherein to read his wondrous works, and learn His seasons, hours, or days, or months, or years. This to attain, whether Heaven move or Earth Imports not, if thou reckon right...
الصفحة 284 - The horizontal distance to which a fluid will spout from a horizontal pipe in any part of the side of an upright vessel, below the surface of the fluid, is equal to twice the length of a perpendicular to the side of the vessel, drawn from the mouth of the pipe to a semicircle described upon the altitude of the fluid : and therefore the...
الصفحة 392 - This will lead us to the explanation of one of the principal definitions in optics, viz. that the angle of reflection is always equal to the angle of incidence.
الصفحة 244 - 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!

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