Problem With The Construction Of Mechanical Wrist Alarm Clocks: Space
When designing a wristwatch, all manufacturers struggle with one problem: space. Because the striking mechanism, consisting of a hammer and a resonance body such as the case back or gong, requires space. The sound also depends on it.
Jaeger-LeCoultre also appeared in 1950 with an equally rasping sound and presented the Memovox. The Latin words “Memorare” and “Vox” mean “voice of memory.” The Memovox was adjusted via a second crown. The rotating disc with an arrow distinguished the watch from ordinary three-hand watches. The first alarm clock caliber 489 from Jaeger-LeCoultre found space in a 35-millimeter case.
It was powered by two barrels, each wound over a crown. The specially constructed resonator emitted an audible alarm tone for a full 20 seconds, a loud and tangible reminder of the selected point in time. The manufacturer equipped the soundboard with a small pen that struck the alarm hammer. If the clock was on the bedside table, the free-swinging floor was used in its entirety.
So, the volume was sufficient to bring a sleeper out of the realm of dreams. Worn on the wrist, there was only a subtle rattle, as the vibration behavior of the floor on the skin was different. In 1956 Jaeger-LeCoultre introduced the first automatic watch with an alarm function, in which the caliber 815 was installed. Its pendulum flywheel wound both the clockwork and the alarm clockwork. You can find out more about the famous Memovox alarm clock from Jaeger-LeCoultre here.
Wrist Alarm Clock In The 1950s
With the caliber 230, Venus presented an extensive series movement in 1953 that was switched on and used by numerous manufacturers. Equipped with 17 or 20 stones, it beat at a leisurely 18,000 A / h. A window at nine o’clock showed in green or red whether the alarm mechanism was on. Smaller brands also use the plant, so it has a high value on the used market. Search for Rolex service center (ศูนย์ โร เล็ก ซ์ which is the term in Thai)
Because the smaller the label, the smaller the circulation – right up to the local jeweler and goldsmith who only made a few dozen pieces. Pierce entered the race with two volumes and produced the Duo Fon in 1954. Her 13-line movement with 21 stones and a double-barrel offered two different wake-up intensities – for a subtle reminder during the day and a real wake-up call in the morning. This caliber 135 was Pierce’s first and only proprietary alarm clockwork.