Archivo: Marrisons quartz crystal clock

Descripción: One of the first experimental quartz clocks, invented by physicist Warren Marrison around 1927 at Bell Telephone Laboratories. It keeps time with an electronic oscillator controlled by the quartz crystal under the dome vibrating at 100 kilohertz. The clock's signal is divided down in frequency by vacuum tube counters, and controls the synchronous electric clock on the front. The caption states it keeps time to better than one hundredth of a second per day
Título: Marrisons quartz crystal clock
Créditos: Retrieved 14 May 2024 from Electronics magazine, McGraw-Hill Co., New York, Vol.2, No.5, May 1931, p.652 without attribution. This publication's copyright would have been renewed in 1959. The Online Books record of copyright renewals for Electronics lists no renewals. Therefore it was not renewed and is in the public domain
Autor(a): DesconocidoUnknown author
Términos de Uso: Dominio Público
Licencia: Dominio Público
¿Se exige la atribución?: No