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 vi
... Pulley ; Of the Wheel and Axle ; Of the inclined Plane ; Of the Wedge ; Of the Screw . Pages 60 , 68 . CONVERSATION VI . ASTRONOMY . Causes of the Earth's Annual Motion . Of the Planets , and their motion ; Of the Diurnal motion of the ...
... Pulley ; Of the Wheel and Axle ; Of the inclined Plane ; Of the Wedge ; Of the Screw . Pages 60 , 68 . CONVERSATION VI . ASTRONOMY . Causes of the Earth's Annual Motion . Of the Planets , and their motion ; Of the Diurnal motion of the ...
Page 60
... pulley , the wheel and axle , the inclined plane , the wedge , and the screw . In order to understand the power of a machine , there are four things to be considered . 1st . The power that acts : this consists in the effort of men or ...
... pulley , the wheel and axle , the inclined plane , the wedge , and the screw . In order to understand the power of a machine , there are four things to be considered . 1st . The power that acts : this consists in the effort of men or ...
Page 68
... pulley is the second mechanical power we are to examine . You both , I suppose , have seen a pulley ? Caroline . Yes , frequently : it is a circular and flat piece of wood or metal , with a string which runs in a groove round it ; by ...
... pulley is the second mechanical power we are to examine . You both , I suppose , have seen a pulley ? Caroline . Yes , frequently : it is a circular and flat piece of wood or metal , with a string which runs in a groove round it ; by ...
Page 69
... pulley which is not fixed , ( fig . 2. ) and thus situated you will perceive that it affords us mechanical assistance . In order to raise the weight ( W ) one inch , P ... pulley , or without any pulley , ON THE MECHANICAL POWERS . 69.
... pulley which is not fixed , ( fig . 2. ) and thus situated you will perceive that it affords us mechanical assistance . In order to raise the weight ( W ) one inch , P ... pulley , or without any pulley , ON THE MECHANICAL POWERS . 69.
Page 70
... pulley , or without any pulley , the weight is raised as much as the string is shortened . : Mrs. B. The advantage of a moveable pulley consists in dividing the difficulty ; we must draw , it is true , twice the length of the string ...
... pulley , or without any pulley , the weight is raised as much as the string is shortened . : Mrs. B. The advantage of a moveable pulley consists in dividing the difficulty ; we must draw , it is true , twice the length of the string ...
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Common terms and phrases
angle appear astronomy atmosphere attraction of cohesion axis ball called camera obscura Caroline centre of gravity centrifugal force circle cohesive attraction concave mirror consequently convex mirror dark degrees diminished direction distance diurnal motion earth eclipse effect elastic Emily equal equator explain figure fixed stars fluid focus force fulcrum geometry glass globe greater heat illustrated lens less lever liquids mechanical power mercury meridian moon motion move Natural Philosophy nature object obliquely observe opaque body opposite orbit particles pass pendulum perpendicular planets plate poles pressure produced proportion pulley pump rays fall rays of light reflected rays reflecting telescope refraction represents resistance retina revolve round right line rise round the sun shadow shines side situated solar solid bodies sonorous body sound space specific gravity sphere spring sun's rays suppose surface tides tion tube understand vapor velocity vibrations weight whilst wind