Longcase clock

Abstract: Pt. The Time of Day The Planetary Basis of Our Day The Sundial and Its Temporary Hours The Measurement of the Night Hours The Canonical Hours The Selling of Time The Mechanical Clock: The Product The Mechanical Clock: The Machine The Early Machines The Pendulum The Longitude: Where Where Becomes When Of Time and the Railroad The Worldwide Web of Time A Watch on Every Wrist New Vibrations The Clock and Charles Darwin Pt. The Time of the Earth Of Clocks and "Clocks" The Circle and the (Short) Line Discovering the "Dark Abyss" The Battle of the Geologists and the Physicists The Clock That Worked The Past Recaptured Finding the Time of Humankind The Clock That Came from Outer Space References Index

Abstract: A simulated clock apparatus utilizes a housing having an opening therein and a shelf disposed in the housing below the opening. A conventional wristwatch is adapted to be rested on the shelf so as to have the face of the clock exposed for external viewing through the opening. A pendulum is pivotably secured to the shelf and is displayed visibly through a second opening located below the opening. The pendulum may be continuously oscillated back and forth in conventional "Grandfather Clock" fashion by a bar passing through a solenoid coil, such that the bar is urged into oscillatory motion, when contacting an electrical switch at an end thereof such that the switch is operated into a closed position causing a current flow from the battery, housed within the housing, to exert a pulling force on a ferromagnetic portion of the center of the bar. When the bar moves away from its displaced non centric position towards a rest position, the switch is opened causing the current flow to cease such that the momentum of the bar causes an override and continued oscillation until the next cycle wherein the switch again is urged into a closed position by contacting the end of the bar. The pendulum, by moving back and forth, creates a miniature effect of a "Grandfather Clock," coupled with the actual operating of the wrist-watch hand. The wrist-watch may be secured into the storage position within the housing utilizing a block of foam rubber-like material.

Abstract: The invention discloses a clock synchronization method and a device of a communication network. The method comprises the steps of: a current clock node receives a notification message and other PTP (Precision Time Protocol) protocol messages sent by an upstream clock node; when judging that the current clock node needs to be synchronized with the upstream clock node, extracting a grandfather clock ID in the notification message; and when judging that the grandfather clock ID in the notification message is different from the own clock ID of the current clock node or judging that the grandfather clock ID in the notification message is different from the clock ID recorded by the current clock node, carrying out time synchronization operation according to time information of the other PTP protocol message and time information of the current clock node. The invention has the advantages that the occurrence of a clock loop is effectively prevented, normal synchronization between the clock nodes in the network is ensured, the own strategy is adjusted when the clock loop occurs on the upstream, the synchronization with a clock source with the loop is avoided, the clock deterioration is prevented, and the synchronization quality is improved.

Abstract: The orbital motion of particles at the surface of a steep gravity wave consists very nearly of a uniform translation superposed on the backward swing of a pendulum.