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Pulsar P4 Time Computer with LED display ref. 3215-2 mens stainless steel watch circa 1975 Made in the USA A Pulsar LED watch from 1976. In 1970, Pulsar was a brand of the American Hamilton Watch Company which first announced that it was making and bringing the LED watch to market. It was developed jointly by American companies Hamilton and ...
A puzzle ring is a jewelry ring made up of multiple interconnected bands, which is a type of mechanical puzzle most likely developed as an elaboration of the European gimmal ring. [1] The puzzle ring is also sometimes called a "Turkish wedding ring" or "harem ring." According to popular legend, the ring would be given by the husband as a ...
The first digital watch was the Pulsar, introduced by the Hamilton Watch Company in 1972. The "Pulsar" became a brand name, and would later be acquired by Seiko in 1978. In 1982, a Pulsar watch (NL C01) was released which could store 24 digits, likely making it the first watch with user-programmable memory, or the first "memorybank" watch.
A 16th-century portable drum watch with sundial. The 24-hour dial has Roman numerals on the outer band and Hindu–Arabic numerals on the inner one. [1]The history of watches began in 16th-century Europe, where watches evolved from portable spring-driven clocks, which first appeared in the 15th century.
Several subtypes are included under this category, the names of which are sometimes used synonymously for the group: wire puzzles; nail puzzles; ring-and-string puzzles; et al. [2] [3] Although the initial object is disentanglement, the reverse problem of reassembling the puzzle can be as hard as—or even harder than—disentanglement. There ...
November 1917 ad for an Ingersoll "Radiolite" watch, one of the first watches mass marketed in the USA featuring a radium-illuminated dial. Radium was discovered by Marie and Pierre Curie in 1898 [1] and was soon combined with paint to make luminescent paint, which was applied to clocks, airplane instruments, and the like, to be able to read them in the dark.
Although the puzzle is a disentanglement-type puzzle, it also has mechanical puzzle attributes, and the solution can be derived as a binary mathematical procedure. The Chinese rings are associated with the tale that in the Middle Ages , knights would give these to their wives as a present, so that in their absence they may fill their time.
A baguenaudier Diagrammatic representation of a four-ring baguenaudier A metal version of the puzzle. Baguenaudier (pronounced; French for "time-waster"), [1] also known as the Chinese rings, Cardan's suspension, Cardano's rings, Devil's needle or five pillars puzzle, is a disentanglement puzzle featuring a loop which must be disentangled from a sequence of rings on interlinked pillars. [1]
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