 | 1835 - عدد الصفحات: 480
...blade, which rests on plains of polished agates : with these precautions, a pendulum, notwiihstanding the resistance of the air and the friction at the point of suspension, will vibrate for many hours. The time occupied in an oscillation, when it is not very considerable,... | |
 | John Henry Pratt - 1836 - عدد الصفحات: 672
...the balance of a watch, by the machinery which serves to maintain that motion. If a pendulum vibrate uninfluenced by any external forces except that of...gravity, the resistance of the air and the friction of the point of suspension gradually reduce the extent of vibration. But this diminution goes on very... | |
 | William Mullinger Higgins - 1838 - عدد الصفحات: 532
...knife-blade which rests on planes of polished agate : with these precautions a pendulum, notwithstanding the resistance of the air and the friction at the point of suspension, will vibrate for many hours. The time occupied in an oscillation is the same, whatever its extent,... | |
 | Alonzo Gray - 1850 - عدد الصفحات: 422
...indefinite extent. In the pendulum of the common clock it is necessary to add a slight force to overcome the resistance of the air and the friction at the point of suspension. For this purpose, a weight, W, is applied to an axle connected with a wheel with teeth, and its motion... | |
 | John Drew - 1853 - عدد الصفحات: 386
...friction against the surface. A pendulum made to vibrate will, after no long time, cease, being impeded by the resistance of the air, and the friction at the point of suspension ; in a vacuum the latter obstacle only has to be overcome, and there it will continue to vibrate for... | |
 | John Johnston - 1864 - عدد الصفحات: 196
...force of gravity. 4. Will it when once put in motion, continue ita oscillations perpetually ? No ; the resistance of the air, and the friction at the point of support will, after a time, bring it to rest. c The Pendulum. 5. What is the use of the pendulum in... | |
 | William James Rolfe, Joseph Anthony Gillet - 1868 - عدد الصفحات: 554
...there not some means of keeping up the motion of the pendulum, it would soon be brought to rest by the resistance of the air and the friction at the point of suspension. Its motion is kept up by means of the escapement, which is so constructed as to give it a slight push... | |
 | William James Rolfe, Joseph Anthony Gillet - 1869 - عدد الصفحات: 364
...there not some means of keeping up the motion of the pendulum, it would soon be brought to rest by the resistance of the air and the friction at the point of suspension. Its motion is kept up by means of the escapement, which is so constructed as to give it a slight push... | |
 | Samuel Laing - 1892 - عدد الصفحات: 336
...position. If we let it go it swings backwards and forwards between the positions AB and AD, and but for the resistance of the air and the friction at the point of suspension, it would so swing for ever. But in thus swinging what happens ? From AB to A c energy of motion keeps... | |
 | C. L. Hotze - 1897 - عدد الصفحات: 388
...be suspended by a string and then make it revolve around the point of suspension of the string. If gravity, the resistance of the air, and the friction at the point of suspension were out of the way, the object would revolve permanently. Circular motion arises whenever a body receives... | |
| |
... in which the bob is conceived to be a mere material particle, and the suspending rod is assumed to be devoid of mass, and the motion is assumed to be confined to some one vertical plane passing through the point of support, and all retarding influences,... 
