O transitory defect any identifying typewriter

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O.TRANSITORY DEFECT- Anyidentifyingtypewriter characteristicswhich can be eliminated by cleaning the machine or replacingthe ribbon is described as a transitory defects. Clogged type is themost common defects in this class.P.TWISTED LETTER- Each letter and character is designed to printa certain fixed angle to the base line, due to wear, and damage tothe type bars and the type block, some letters become twisted sothat they lean to the right or left of their correct slant.Q.TYPE FACE- The printing surface of the type block is known as thetype face, with most modern typewriter this block is attached atthe end of a movable arm or type bar which propels the type faceagainst the ribbon and paper to make the typewriter impression.R.TYPE FACE DEFECTS- Any peculiarity of typewriting caused byactual damage to the type face metal is known as type face defect.These defect may be actual breaks in the outline of the letter wherethe metal has been chipped away sometimes referred to as brokentype, or they may be distorted outlines of the letter where thetype face metal has become bent or smashed, they can only becorrected by replacing the type block.EVOLUTION OF TYPEWRITERS1.The first patent, however, was granted byQUEEN ANNEof England toHENRY MILLin1714for a machine designed to reproduce a letter ofthe alphabet.2.In1829,WILLIAM AUSTIN BURTof Detroit, invented the TYPOGRAPHER.3.In1833a French patent was given to theFrenchinventorXavierProginfor a machine that embodied for the first time one of theprinciples employed in modern typewriters: the use for each letter orsymbol of separate typebars, actuated by separate lever keys.
4.In1843,AmericaninventorCharles Grover Thurberinvented atypewriter which prints through a metal ring that revolvedhorizontally above the platen and was equipped with a series ofvertical keys or plungers having pieces of type at the bottom. Themachine was operated by revolving the wheel until the correct letterwas centered over the printing position on the platen, and thenstriking the key.5.Several other inventors attempted to produce machines designed tomake embossed impressions that could be read by the blind. One suchmachine, developed by theAmericaninventorAlfred Ely Beachin1856,resembled the modern typewriter in the arrangement of its keys andtypebars, but embossed its letters on a narrow paper strip instead ofa sheet.6.A similar machine created by theAmericaninventorSamuel W. Francis,and patented by him in1856, had a circular arrangement of typebars,a moving paper holder, a bell that rang to signal the end of a line,and an inked ribbon. The keyboard arrangement of Francis's machineresembled the black and white keys of a piano.7.The development of the first practical typewriter begun in1866byCHRISTOPHER LATHAM SHOLESand was patented in1868. He developed thefirst practical typewriter in cooperation with two fellow mechanics,CARLOS GLIDENandSAMUEL SOULE'.

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