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A pattern notcher is a common tool used in patternmaking and sewing that creates a notch in a paper pattern. [1] Notches are used to align pattern pieces. Notches in the paper are more useful than marks on the paper as they allow the mark to be seen whether pattern paper is face up or face down.
End notching works the end of the tube, such as a semicircular concavity to make the base of a tee, or a convex vee to fit into a mitre. Vee-notched tube, bent for assembly of a mitred joint. Side notching (also called offset notching) works the side of a tube with a vee notch for bending, semicircular or vee notches for tee joint.
Hand tool for notching cards. To record data, the paper stock between a hole and the nearest edge was removed by a special notching tool. The holes were assigned a meaning dependent upon a particular application. For example, one hole might record the answer to a yes/no question on a survey, with the presence of a notch meaning "yes".
dart A dart is a common technique used for shaping garments. Darts are created by stitching out a wedge-shaped fold of fabric. They vary in width and length and can be tapered at one or both ends.
The drum rotated as the card being punched moved through the punching mechanism. The holes in the program card were sensed by an array of starwheels that would cause levers to rise and fall as the holes in the program card passed beneath the starwheels, activating electrical contacts. The program was encoded in the top six rows [12,11,0,1,2,3].
A vacuum-tube computer, now termed a first-generation computer, is a computer that uses vacuum tubes for logic circuitry. While the history of mechanical aids to computation goes back centuries , if not millennia , the history of vacuum tube computers is confined to the middle of the 20th century.
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