Conversations on Natural Philosophy: In which the Elements of that Science are Familiarly Explained and Adapted to the Comprehension of Young Pupils : Illustrated with Plates |
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Page 60
... axis of motion . In a top , for instance , when spinning on its point , the axis is the line which passes through the middle of it , perpendicularly to the floor . Caroline . The axle of the flyers of the windmill , is then the axis of ...
... axis of motion . In a top , for instance , when spinning on its point , the axis is the line which passes through the middle of it , perpendicularly to the floor . Caroline . The axle of the flyers of the windmill , is then the axis of ...
Page 61
... axis of motion . This line you must observe remains at rest , whilst all the other parts of the body move around it ; when you spin a top the axis is stationary whilst every other part is in motion round it . Caroline . But a top ...
... axis of motion . This line you must observe remains at rest , whilst all the other parts of the body move around it ; when you spin a top the axis is stationary whilst every other part is in motion round it . Caroline . But a top ...
Page 69
... axis of motion ; as we observed in the motion of the vanes of the windmill . Mrs. B. We shall now examine the power of the lever . The lever is an inflexible rod or beam of any kind , that is to say , one which will not bend in any di ...
... axis of motion ; as we observed in the motion of the vanes of the windmill . Mrs. B. We shall now examine the power of the lever . The lever is an inflexible rod or beam of any kind , that is to say , one which will not bend in any di ...
Page 71
... axis of motion the greater is its velocity . Caroline . That I remember and understood per- fectly . Mrs. B. You comprehend then , that the extremity of the longest arm of a lever must move with greater velocity than that of the ...
... axis of motion the greater is its velocity . Caroline . That I remember and understood per- fectly . Mrs. B. You comprehend then , that the extremity of the longest arm of a lever must move with greater velocity than that of the ...
Page 97
... axis . The axis of a planet is an im- aginary line which passes through its centre , and on which it turns ; and it is this motion which produces day and night . With that side of the planet facing the sun it is day ; and with the ...
... axis . The axis of a planet is an im- aginary line which passes through its centre , and on which it turns ; and it is this motion which produces day and night . With that side of the planet facing the sun it is day ; and with the ...
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Common terms and phrases
angle appear atmosphere attraction of cohesion axis ball called camera obscura Caroline centre of gravity centrifugal force circle coloured rays concave mirror consequently convergent convex mirror degrees descend diminishes direction distance diurnal motion divergent draw earth eclipse effect elastic Emily equal equator fixed stars fluid focus force fulcrum glass globe goblet greater heat heavier incident rays LENOX AND TILDEN lens less lever liquid mechanical power mercury meridian moon motion move nature nearer object observe orbit parallel rays particles pass perfectly perpendicular Philad planets plate pole pressure proceed produced proportion pulley pump quantity rays fall rays of light reflected rays refraction resistance retina rise round the sun shadow shine situated solid bodies space specific gravity sphere spout spring sun's rays supported suppose surface TILDEN FOUNDATIONS tion true tube understand vapour velocity vibrations weight whilst wind YORK PUBLIC LIBRARY
Popular passages
Page 102 - Now came still evening on, and twilight gray Had in her sober livery all things clad ; Silence accompanied ; for beast and bird, They to their grassy couch, these to their nests Were slunk, all but the wakeful nightingale ; She all night long her amorous descant sung...
Page 102 - The starry host, rode brightest, till the moon, Rising in clouded majesty, at length, Apparent queen, unveil'd her peerless light, And o'er the dark her silver mantle threw.
Page 77 - ... time that the axle describes a small one, therefore the power is increased in the same proportion as the circumference of the wheel is greater than that of the axle. If the...
Page 216 - The construction of the eye is so admirable, that it is capable of adapting itself, more or less, to the circumstances in which it is placed. In a faint light the pupil dilates so as to receive an additional quantity of rays, and in a strong light it contracts, in order to prevent the intensity of the light from injuring the optic nerve.
Page 49 - B it receives in return a blow equal to that which it gave, but in a contrary direction, and its motion is thereby stopped, or rather, given to B. Therefore, when a body strikes against another, the quantity of motion communicated to the second body...
Page 202 - ... the white rays of the sun are composed of coloured rays, which when blended together, appear colourless or white. Sir Isaac Newton, to whom we are indebted for the most important discoveries respecting light and colours, was the first who divided a white ray of light, and found it to consist of an assemblage of coloured rays, which formed an image upon the wall, such as is exhibited, in which are displayed the following series of colours — red, orange, yellow, green, blue, indigo, and violet.
Page 64 - The curve-line which the ball has described, is called in geometry, a parabola; but when the ball is thrown perpendicularly upwards, it will descend perpendicularly ; because the force of projection, and that of gravity, are in the same line of direction. We have noticed the centres of magnitude, and of motion ; but I have not yet explained to you what is meant by the centre of gravity ; it is that point in a body, about which all the parts exactly balance each other ; if, therefore, that point is...
Page 134 - I hope, thoroughly impressed upon your memory, by the conversation we have subsequently had on astronomy. It will now be necessary for me to give you some account of the mechanical properties of fluids, a science which is called hydrostaticS. A fluid is a substance which yields to the slightest pressure. If you dip your hand into a basin of water, you are scarcely sensible of meeting with any resistance.
Page 117 - We shall now explain the variation of the seasons, and the difference of the length of the days and nights in those seasons — both effects resulting from the same cause.
Page 143 - All the metals expand by heat, and condense by cold. A piece of lead, let us say a cubic inch, for instance, would have less specific gravity in summer than in winter; for it would be more dense in the latter season. CAROLINE. • But, Mrs. B., if you compare the weight of equal quantities of different bodies, they will all be alike. You know the old saying, that a pound of feathers is as heavy as a pound of lead ! MRS.