25 – Morse clicker e snapper sounder
La loro particolarità era quella di produrre un suono acuto e improvviso (snapper) sia alla pressione che al rilascio di una lamina particolare. Quindi fungevano contemporaneamente da tasto e da sounder. Ne furono commercializzate varie versioni, da quelle a pochi cents (disegno a sinistra) a quelle a un dollaro (a destra).
Non ebbero molta diffusione per i motivi che mi spiegò il grande Bill Pierpont (N0HFF):
The clicker or cricket was not a morse tool in anyway although it can be mistaken for it. It was made out of tinplate with a thin steel ribbon rivited on the inside - the cup of the cricket acted as a resonator or amplifier of the sound - the movie you speak off (“Il giorno più lungo”), it sounded more like a bolt on a rifle and was mistaken quite correctly as that in a few cases - because of the response time by depressing the thumb on the steel ribbon,it could not be effectively used to send code - far too slow.
forchette sul tavolo di cucina)
"joujou" ("toy") is not a bad classification, although it
was developed as a noise-maker (such as at a children
"cricket" (this usage of the word is not in Webster
When this strip is held firmly at one end and the other end is pressed in the direction toward the concavity of the dimple, it will suddenly bend (with a snapping sound) from it original position to a new position – as long as the pressure is maintained. When the pressure is released it snaps back to its original position with a sharp and somewhat different sound.
(it must have been in the mid or late 1800
Some telegrapher must have played with one and thought: "That sounds a lot like the clicking of a sounder. I can time the space between the squeeze and its release and make dots and dashes of any length."
That idea took hold and was practical for practicing the code away from actual keys and sounders.
Those "crickets" were sold by the millions at stores carrying toys, novelties, party trinkets, etc. They were available in several sizes and sold for as little as a "nickel" (5 cent coin) at what we commonly called "dime" (10 cent coin) stores. (Several chains of such stores which carried small merchandize and notions at low prices: sometimes were called "5, 10 and 25 Cent Stores" -- Kresge, Kress, Woolworth and others.)
still have some of these crickets around home here somewhere.. .
Da qualche tempo in Europa sta diffondendosi il Clicker-training, una tecnica per addestramento di cani (a rinforzi positivi) che si avvale della precisione e coerenza del segnale acustico del clicker.