Conversations on Natural Philosophy: In which the Elements of that Science are Familiarly Explained and Adapted to the Comprehension of Young Pupils : Illustrated with PlatesJ.Y. Humphreys, 1821 - 311 من الصفحات |
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الصفحة vi
... - dulum . Of the Variation of the Seasons , and of the Length of Days and Nights . - Of the Causes of the Heat of Summer . - Of So- lar , Siderial , and Equal or Mean Time . CONVERSATION IX . ON THE MOON . 132 Of the vi CONTENTS .
... - dulum . Of the Variation of the Seasons , and of the Length of Days and Nights . - Of the Causes of the Heat of Summer . - Of So- lar , Siderial , and Equal or Mean Time . CONVERSATION IX . ON THE MOON . 132 Of the vi CONTENTS .
الصفحة 14
... mean substances , of what ever nature , whether solid or fluid ; and matter is the general term used to denote the substance , whatever its nature be , of which the different bodies are composed 1,4 GENERAL PROPERTIES OF BODIES .
... mean substances , of what ever nature , whether solid or fluid ; and matter is the general term used to denote the substance , whatever its nature be , of which the different bodies are composed 1,4 GENERAL PROPERTIES OF BODIES .
الصفحة 15
... meaning of the word matter , as it has corrected an er- roneous conception I had formed of it : I thought that it was applicable to solid bodies only . Mrs. B. There are certain properties which appear to be common to all bodies , and ...
... meaning of the word matter , as it has corrected an er- roneous conception I had formed of it : I thought that it was applicable to solid bodies only . Mrs. B. There are certain properties which appear to be common to all bodies , and ...
الصفحة 17
... means of pounding , grinding , and other similar methods , we car- ry this division to the greatest possible extent , and re- duce the body to its finest imaginable particles , yet not one of the particles will be destroyed , and the ...
... means of pounding , grinding , and other similar methods , we car- ry this division to the greatest possible extent , and re- duce the body to its finest imaginable particles , yet not one of the particles will be destroyed , and the ...
الصفحة 21
... meaning better by the term density , which denotes the degree of closeness and compactness of the particles of a body : thus you may say , both of solids , and of liquids , that the stronger the cohesive attraction , the greater is the ...
... meaning better by the term density , which denotes the degree of closeness and compactness of the particles of a body : thus you may say , both of solids , and of liquids , that the stronger the cohesive attraction , the greater is the ...
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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
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الصفحة 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...
الصفحة 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.
الصفحة 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...
الصفحة 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.
الصفحة 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...
الصفحة 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.
الصفحة 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...
الصفحة 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.
الصفحة 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.
الصفحة 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.