horizontal pendulum การใช้

• These seismometers used damped horizontal pendulums.
• The advantage of a horizontal pendulum is that it achieves very low frequencies of oscillation in a compact instrument.
• A mechanically coupled horizontal pendulum for measurements of the inclination of the Earth's surface was constructed here by Heinz Lettau in 1936 1937.
• He was elected a Fellow of the Royal Society in 1887 and persuaded the Society to fund 20 earthquake observatories around the world, equipped with his horizontal pendulum seismographs.
• It was the home and workplace of John Milne ( 1850 & ndash; 1913 ), inventor of the horizontal pendulum seismograph after he retired from the Imperial College of Engineering in Tokyo, Japan.
• Cracks formed in the rocks and a rock slide came within of the apparatus, and the foundation remained undamaged, but a small ( half-degree ) tilt of the unit was discovered that was apparently responsible for closing the horizontal pendulum contacts.
• When the paddle is pressed to the right, a horizontal pendulum is set into motion which rocks against the contact points, sending a series of short pulses ( " dits " ) at a speed which is controlled by the position of the pendulum weight.
• When the paddle is pressed from the left, a horizontal pendulum at the opposite end of the lever is set into motion, intermittently closing a set of contacts, sending a series of short pulses " ( dits ) " at a speed that is controlled by the position of the pendulum weight.