A Plain Elementary and Practical System of Natural Experimental Philosophy: Including Astronomy and Chronology |
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Page iv
... Objects by Refraction 343 Vision through Lenses Of Concave Lenses Of the Eye , and Vision Of Ocular Spectra Of reverse Ocular Spectra Of Optical Instruments Microscopes 347 353 354 376 381 385 385 Telescopes 388 The Magic Lantern 397 ...
... Objects by Refraction 343 Vision through Lenses Of Concave Lenses Of the Eye , and Vision Of Ocular Spectra Of reverse Ocular Spectra Of Optical Instruments Microscopes 347 353 354 376 381 385 385 Telescopes 388 The Magic Lantern 397 ...
Page vii
... object of biography , so illustrious as Johnson , yet al- most every year takes from us some one whose exam- ple might give ardour to virtue and confidence to truth . In the hasty and indiscriminate biographical compi- lations which ...
... object of biography , so illustrious as Johnson , yet al- most every year takes from us some one whose exam- ple might give ardour to virtue and confidence to truth . In the hasty and indiscriminate biographical compi- lations which ...
Page xxi
... objects of " his investigation ; and we cannot but suppose him " to have been gifted with diversified talents , who " could scan the illuminated glories of the heavens , " and inspect the insect which is only visible to the ...
... objects of " his investigation ; and we cannot but suppose him " to have been gifted with diversified talents , who " could scan the illuminated glories of the heavens , " and inspect the insect which is only visible to the ...
Page 12
... objects of natural philoso- phy ; the design of which is to explain the various phenomena of the natural world . And it is the busi- ness of the philosopher , by the most accurate and careful methods in his power , to distinguish ...
... objects of natural philoso- phy ; the design of which is to explain the various phenomena of the natural world . And it is the busi- ness of the philosopher , by the most accurate and careful methods in his power , to distinguish ...
Page 19
... object , which has no solidity , appears equally extended with the object itself , and may ap pear also in the same place . Air and water are equally solid with the hardest metals . FIGURABILITY is that property of body , whereby it is ...
... object , which has no solidity , appears equally extended with the object itself , and may ap pear also in the same place . Air and water are equally solid with the hardest metals . FIGURABILITY is that property of body , whereby it is ...
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Common terms and phrases
acquired altitude angle of incidence angle of refraction appear arch atmosphere attraction axis bulk called center of force central force circle colour concave concave lens converge convex lens curve cycloid degree denser medium density descend diameter direction diverge earth ecliptic elastic electricity ellipsis equal equator fall feet fluid focal distance friction given glass globe greater greatest half heat heavy body Hence hole horizon increased inversely latus rectum length less magnet mercury meridian mirror moon moon's motion move nearer nonconductor object observed octave orbit parabola parallel particles pass pendulum perpendicular plane Plate pole pressure prime conductor produced projectile proportional quantity of matter radiant point radius rays of light reflected reflexion retina revolving right ascension round side sine sound space specific gravity square root string sun's surface syzygies tance tangent telescope thereby tides tion tube velocity vessel vial vibrations weight wheel wind
Popular passages
Page iii - Co. of the said district, have deposited in this office the title of a book, the right whereof they claim as proprietors, in the words following, to wit : " Tadeuskund, the Last King of the Lenape. An Historical Tale." In conformity to the Act of the Congress of the United States...
Page iii - An Act supplementary to an Act, entitled " An Act for the Encouragement of Learning, by securing the copies of Maps, Charts, and Books, to the authors and proprietors of such copies during the time* therein mentioned," and extending the benefits thereof to the arts of designing, engraving, and etching historical and other prints.
Page 264 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page iii - An Act for the encouragement of learning, by securing the copies of maps, charts, and books, to the authors and proprietors of such copies during the times therein mentioned." And also to the act, entitled " An Act supplementary to an Act, entitled, " An Act for the encouragement of learning, by securing the copies of maps, charts, and books, to the authors and proprietors of such copies during the time therein mentioned," and extending the benefits thereof to the arts of designing, engraving, and...
Page 266 - This amounts to the same with saying, that, in the case before us, the sine of the angle of incidence is to the sine of the angle of refraction in a given ratio.
Page xiii - Alison, his former tutor and friend, and, after the usual period of preparatory study, he was licensed to preach the Gospel by the presbytery of Newcastle, in the state of Delaware.
Page 162 - And hence, as the specific gravity of the fluid is to that of the body, so is the whole magnitude of the body to the part immersed.
Page xxiv - His own investigation confirmed him in his belief of the doctrines of grace. These were the doctrines which he preached and which he endeavoured to impress upon the hearts of his people.* His discourses were written with accuracy; the truths which they contained were well examined and digested before he ventured to offer them to the public. He thought it a duty which he owed to his God and his hearers, to think before he spoke, to study and to ponder in private, before he arose in the presence of...
Page xxvi - ... pastoral charge. The only serious disorder which he had, was the one which proved fatal, and which first seized him (in 1796) six years before his death. After his first attack he frequently preached, but never regained his strength of body, or vigour of mind. In his sickness he discovered patience, fortitude and resignation to the will of his heavenly Father. No murmur escaped his lips, and his last moments were closed apparently without a pang and without a struggle. In a good old age, in his...
Page xxv - ... that weep. He was perfectly free from pedantry, and from every thing that bore its resemblance. In the company of philosophers, he was in his conversation the philosopher, and with the unlettered, the man of ease and accommodation. His talent of narration was universally admired. His observation of men and manners in this country and abroad furnished him with many scenes and facts which as painted and related by him were extremely entertaining. In domestic life he was amiable. He had all the...