Scientific dialogues, with corrections by O. Gregory

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Contents

Of the SteamEngine
240
Of the SteamEngine and Papins Digester
246
Conversation Page xix Of the Barometer
249
Of the Barometer and its Application to the Measuring of Altitudes
252
Of the Thermometer
256
Of the Thermometer
259
Of the Pyrometer and Hygrometer
262
Of the RainGauge
266
APPENDIX TO PNEUMATICS Of Air as a vehicle of heat and moistureOf Rain Dew Meteoric Stones
269
Introduction Of Lightits Velocitymoves only in straight lines
272
Of Rays of LightOf Reflection and Refraction
274
Of the Refraction of Light
277
Of the Reflection and Refraction of Light
280
Definitions of the different kinds of Lensesof Mr Parkers Burning Lens and the effects produced by it
283
Of Parallel Raysof Diverging and Converging Rays of the Focus and Focal Distances
286
Images of Objects invertedOf the Scioptric Ballof Lenses and their Foci
288
Of the Nature and Advantages of Lightof the separa tion of the Rays of Light by means of a Prismand of Compounded Rays c
290
Of Colours
293
Reflected Light and Plane Mirrors
296
Of Concave Mirrorstheir useshow they act
298
On Concave Mirrors and Experiments on them
300
Of Concave and Convex Mirrors
302
Of Convex Reflection of Optical Delusionsof Anamor phoses
304
Of the different Parts of the Eye
307
Conversation Page
309
Of the Camera Obscura Magic Lantern and Multiplying
330
Of the MagnetIts PropertiesUseful to Mariners
340
Of the Variation of the Compass
347
Of Electric Attraction and RepulsionOf Electrics
354
Of Electrical Attraction and Repulsion
366
Of the Leyden JarLanes Discharging Electrometer
372
Conversation Page
381
xvii General Summary of Electricity with Experiments
398
Galvanic Light and ShocksVoltaism
404
Miscellaneous Experiments
414
MagnetoElectricityThermoElectricity
422
221
425

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Page 298 - ... 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.
Page 268 - ... 1. The rising of the mercury presages, in general, fair weather, and its falling foul weather, as rain, snow, high winds, and storms.
Page 113 - Annual for me, the grape, the rose renew The juice nectareous, and the balmy dew; For me, the mine a thousand treasures brings; For me, health gushes from a thousand springs; Seas roll to waft me, suns to light me rise; My foot-stool earth, my canopy the skies.
Page 97 - This alteration took place through the greater part of Europe, and the year was afterwards called the Gregorian year, or New Style. In this country, the method of reckoning, according to the New Style, was not admitted into our calendars until the year 1752, when the error amounted to nearly 11 days, which were taken from the month of September, by calling the 3d of that month the 14th.
Page 99 - Shedding sweet influence. Less bright the moon, But opposite in levell'd west was set His mirror, with full face borrowing her light From him, for other light she needed none In that aspect, and still that distance keeps Till night ; then in the east her turn she shines...
Page 106 - The attraction of the sun and moon upon the waters of the ocean. The moon being nearest to the earth, her attraction is six times greater than that of the sun. This attraction of the moon raises the waters of the ocean as they come under her influence by the motion of the earth on its axis.
Page 260 - ... will slide on towards the narrow end, less or more, according to the degree of heat to which it has been exposed*. Each degree of Mr. Wedgewood's thermometer answers to 130 degrees of Fahrenheit, and he begins his scale from red heat fully visible in daylight, which he finds to be equal to 1077 of Fahrenheit's scale, if it could be carried so high.
Page 284 - A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names.
Page 300 - When the object is more remote from the mirror than its centre of concavity C, the image will be less than the object, and between the object and...
Page 43 - ... to his strength; which is done by so dividing the beam they pull, that the point of traction may be as much nearer to the stronger horse than to the weaker, as the strength of the former exceeds that of the latter. To this kind of lever may be reduced...

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