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a Wright Brothers telegraph key (missing its knob) A Morse Key from G. Hasler, Bern (1900) first used by Gotthard Railway A telegraph key, clacker, tapper or morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. [1]
On-load tap changer (OLTC), also known as On-circuit tap changer (OCTC), is a tap changer in applications where a supply interruption during a tap change is unacceptable, the transformer is often fitted with a more expensive and complex on-load tap changing mechanism. On-load tap changers may be generally classified as either mechanical ...
An example of an application of an autotransformer is one style of traveler's voltage converter, that allows 230-volt devices to be used on 120-volt supply circuits, or the reverse. An autotransformer with multiple taps may be applied to adjust the voltage at the end of a long distribution circuit to correct for excess voltage drop; when ...
A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws .
M designates common V threads (like for instance metric threads); Sq designates square threads; Tr designates trapezoidal threads; The shank length is not always the same at the thread length, which is the case if the insert has a threadless portion (sub-shank)
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Reversing type (also reversing, knocking-out, reversed type) is a method of typographic printing with black or colored inks, in which the entire surface is printed, except for text elements. [1] Reversing is one of the special cases of printing on a color solid, when the color of the solid is black or colored, and the color of the letters is white.
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