A Plain Elementary and Practical System of Natural Experimental Philosophy: Including Astronomy and Chronology |
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Page 356
... retina . According to some philosophers , the images of exter- nal objects are painted upon this coat , and by the im- pressions of light upon it , the ideas are communicated to the brain , the common origin of all the nerves . Al ...
... retina . According to some philosophers , the images of exter- nal objects are painted upon this coat , and by the im- pressions of light upon it , the ideas are communicated to the brain , the common origin of all the nerves . Al ...
Page 357
... retina , where they form an inverted image of the ob- ject , by means of which we are made sensible of its existence , position , and motions , although in a man- ner to us incomprehensible . Yet that vision is per- formed by means of ...
... retina , where they form an inverted image of the ob- ject , by means of which we are made sensible of its existence , position , and motions , although in a man- ner to us incomprehensible . Yet that vision is per- formed by means of ...
Page 358
... retina ; as is evident from the case of persons , who have suffered the ex- traction of it , on account of its having become opake . As the image of the object is inverted in the eye , many have wondered how the object should appear to ...
... retina ; as is evident from the case of persons , who have suffered the ex- traction of it , on account of its having become opake . As the image of the object is inverted in the eye , many have wondered how the object should appear to ...
Page 359
... retina , they all preserve their relative positions with respect to each other ; and we have no means of judging an object to be inverted , while it retains its natural posi- tion with respect to all the objects around it . There is ...
... retina , they all preserve their relative positions with respect to each other ; and we have no means of judging an object to be inverted , while it retains its natural posi- tion with respect to all the objects around it . There is ...
Page 360
... retina , which is always done , when the optic axes unite at the object . It is princi- pally from experience that ... retinas , that is , when the axes of the eyes meet at the object . But when the axes of the eyes meet either between ...
... retina , which is always done , when the optic axes unite at the object . It is princi- pally from experience that ... retinas , that is , when the axes of the eyes meet at the object . But when the axes of the eyes meet either between ...
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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...