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Cochrane and McCrone argue that the thumbscrew entered Britain later than the invasion of the Spanish Armada in the 16th century: "It has been very generally asserted," says Dr. Jamieson, "that part of the cargo of the invincible Armada was a large assortment of thumbikens, which it was meant should be employed as powerful arguments for convincing the heretics."
A thimble Der Fingerhüter (Thimblemaker) from Das Ständebuch by Jost Amman, 1568. A thimble is a small pitted cup worn on the finger that protects it from being pricked or poked by a needle while sewing. The Old English word þȳmel, the ancestor of thimble, is derived from Old English þūma, the ancestor of the English word thumb. [1]
Thimble scale: Rotating graduated markings. Lock nut, lock-ring, or thimble lock: The knurled component (or lever) that one can tighten to hold the spindle stationary, such as when momentarily holding a measurement. Thimble: The component that one's thumb turns.
The source material containing the compound to be extracted is placed inside the thimble. The thimble is loaded into the main chamber of the Soxhlet extractor. The extraction solvent to be used is placed in a distillation flask. The flask is placed on the heating element. The Soxhlet extractor is placed atop the flask.
Trachtenberg called this the 2 Finger Method. The calculations for finding the fourth digit from the example above are illustrated at right. The arrow from the nine will always point to the digit of the multiplicand directly above the digit of the answer you wish to find, with the other arrows each pointing one digit to the right.
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The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.
First, every specific note played by the right hand is produced either by the index finger or the thumb. Second, no note is ever plucked; each is played either with the thumb, or by striking down on a string with the nail of the index finger. Third, the index finger never plays off the beat, and the thumb never plays on the beat.