The gridiron pendulum was a temperature-compensated clock pendulum invented by British clockmaker John Harrison around 1726 and later modified by John Ellicott. It was used in precision clocks. In ordinary clock pendulums, the pendulum rod expands and contracts with changes in temperature. The period of the pendulum's swing depends on its length, so a pendulum clock's rate varied with changes in ambient temperature, causing inaccurate timekeeping. The gridiron pendulum consists of alternating parallel rods of two metals with different thermal expansion coefficients, such as steel and brass. The rods are connected by a frame in such a way that their different thermal expansions (or contractions) compensate for each other, so that the overall length of the pendulum, and thus its period, stay
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| - Teplotní kompenzace (cs)
- Kompensation (Uhr) (de)
- Compensación (relojería) (es)
- Gridiron pendulum (en)
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| - Teplotní kompenzace znamená vyrovnávání vlivu teploty na nějaký oscilátor, měřicí zařízení a podobně. Nejprve vznikla u kyvadlových hodin, později i u setrvačkových (přenosných), velký význam měla ve vysokofrekvenční technice. (cs)
- Als Kompensation bezeichnet man in der Uhrmacherei eine spezielle Konstruktion oder Materialauswahl zum Ausgleich störender Umwelteinflüsse auf den Gang einer Uhr. Dieser Artikel bezieht sich auf Räderuhren mit Pendel oder Unruh und auf Schwankungen der Temperatur und des Luftdrucks, nicht jedoch auf den Ausgleich von Stößen (Stoßsicherung) oder die Gleichmäßigkeit des ablaufenden Federwerks (Schnecke und Stackfreed). (de)
- The gridiron pendulum was a temperature-compensated clock pendulum invented by British clockmaker John Harrison around 1726 and later modified by John Ellicott. It was used in precision clocks. In ordinary clock pendulums, the pendulum rod expands and contracts with changes in temperature. The period of the pendulum's swing depends on its length, so a pendulum clock's rate varied with changes in ambient temperature, causing inaccurate timekeeping. The gridiron pendulum consists of alternating parallel rods of two metals with different thermal expansion coefficients, such as steel and brass. The rods are connected by a frame in such a way that their different thermal expansions (or contractions) compensate for each other, so that the overall length of the pendulum, and thus its period, stay (en)
- En la industria relojera se conoce como compensación a un conjunto de diseños especiales (basados generalmente en disposiciones mecánicas que se valen de las propiedades térmicas o mecánicas particulares de determinados materiales) cuya finalidad es corregir las alteraciones de la marcha de un reloj producidas por efectos ambientales (como las variaciones de temperatura o de presión atmosférica). (es)
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| - Teplotní kompenzace znamená vyrovnávání vlivu teploty na nějaký oscilátor, měřicí zařízení a podobně. Nejprve vznikla u kyvadlových hodin, později i u setrvačkových (přenosných), velký význam měla ve vysokofrekvenční technice. (cs)
- Als Kompensation bezeichnet man in der Uhrmacherei eine spezielle Konstruktion oder Materialauswahl zum Ausgleich störender Umwelteinflüsse auf den Gang einer Uhr. Dieser Artikel bezieht sich auf Räderuhren mit Pendel oder Unruh und auf Schwankungen der Temperatur und des Luftdrucks, nicht jedoch auf den Ausgleich von Stößen (Stoßsicherung) oder die Gleichmäßigkeit des ablaufenden Federwerks (Schnecke und Stackfreed). (de)
- The gridiron pendulum was a temperature-compensated clock pendulum invented by British clockmaker John Harrison around 1726 and later modified by John Ellicott. It was used in precision clocks. In ordinary clock pendulums, the pendulum rod expands and contracts with changes in temperature. The period of the pendulum's swing depends on its length, so a pendulum clock's rate varied with changes in ambient temperature, causing inaccurate timekeeping. The gridiron pendulum consists of alternating parallel rods of two metals with different thermal expansion coefficients, such as steel and brass. The rods are connected by a frame in such a way that their different thermal expansions (or contractions) compensate for each other, so that the overall length of the pendulum, and thus its period, stays constant with temperature. The gridiron pendulum was used during the Industrial Revolution period in pendulum clocks, precision clocks employed as time standards in factories, laboratories, office buildings, and post offices to schedule work and set other clocks. The gridiron became so associated with accurate timekeeping that to this day many clocks have pendulums with decorative fake gridirons, which have no temperature compensating qualities. (en)
- En la industria relojera se conoce como compensación a un conjunto de diseños especiales (basados generalmente en disposiciones mecánicas que se valen de las propiedades térmicas o mecánicas particulares de determinados materiales) cuya finalidad es corregir las alteraciones de la marcha de un reloj producidas por efectos ambientales (como las variaciones de temperatura o de presión atmosférica). Este artículo se refiere específicamente a relojes mecánicos de péndulo o de volante regulador, y a las variaciones de la temperatura y de la presión del aire, pero no a la compensación de impactos (sistemas antichoque) o a la regularidad de la marcha de la maquinaria (caracol y "stackfreed"). (es)
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