Tickler Box Sierra Leone
Tickler may refer to: * Tickler file, a collection of date-labeled file folders * Tickler oscillator, a type of electronic circuit Ships * – one of several vessels of the British Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against ...

Tickler File
A tickler file or 43 Folders System is a collection of date-labeled file folders organized in a way that allows time-sensitive documents to be filed according to the future date on which each document needs action. Documents within the folders of a tickler file can be to-do lists, pending bills, unpaid invoices, travel tickets, hotel reservations, meeting information, birthday reminders, coupons, claim tickets, call-back notes, follow-up reminders, maintenance reminders, or any other papers that require future action. Each day, the folder having the current date is retrieved from the tickler file so that any documents within it may be acted on. Essentially, a tickler file provides a way to send a reminder to oneself in the future—"tickling" one's memory. History One common implementation was in law offices in the early twentieth century, if not before, where small task cards or "tickler cards" would be filed by date and then distributed to lawyers as legal tasks such as re ...
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Tickler Oscillator
The Armstrong oscillator (also known as the Meissner oscillator) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation. It is the earliest oscillator circuit, invented by US engineer Edwin Armstrong in 1912 and independently by Austrian engineer Alexander Meissner in 1913, and was used in the first vacuum tube radio transmitters. It is sometimes called a tickler oscillator because its distinguishing feature is that the feedback signal needed to produce oscillations is magnetically coupled into the tank inductor in the input circuit by a "tickler coil" ''(L2, right)'' in the output circuit. Assuming the coupling is weak but sufficient to sustain oscillation, the oscillation frequency ''f'' is determined primarily by the LC circuit (tank circuit L1 and C in the figure on the right) and is approximately given by :f = \frac \, This circuit was widely used in the regenerative radio receiver, popular until the 1940s. In that applic ...
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