Graphs and diagrams can be prepared with great ease with the help of a stylus pen. It would be advisable to wrap them properly so that they can be used when the need arises.
The master can be easily stored for future use and re-use. The original documents or paper is reproduced in thousands and the stencil takes only a few minutes to prepare. In the case of such scanners, photographic copies of any type of documents, illustrations, diagrams whether hand-written, type-written or cyclostyled or printed can be obtained with an electronically produced stencil. These duplicating machines enjoy the advantage of stencil duplications and are versatile. Gestetner is a company which manufactures these machines. These stencil duplicators are becoming very important even after the induction of photocopying machines because of its economy. In this machine the type is set by hand and the printing is done with the help of a ribbon which reproduces a copy similar to a typed copy. This is a small printing press which is operated either manually or with the help of a motor. This is a cumbersome process of mechanisation and, hence, its use is non-existent. In this type of duplicator, there is a tray containing gelatin on which the master prepared with a dye is pressed, the paper to be copied is pressed on the gelatins with a clamp roller to obtain the copy. On the other hand, an unlimited number of copies can be obtained from a duplicating machine. Only a limited member of copies can be obtained if a type-writer is used. In an office, there are times when a number of copies of the same subject-matter is required to be circulated amongst the various departments to the employees. The electronic typewriters are basically divided into three groups:Ĭertain features like right margin alignment, left margin alignment, automatic erasure, tab set, bold type character, automatic underlining, uses of italics character etc., and uses of various floppies of characters make these types of type-writers unique machines to use in the office. The prominent of them were Gestetner, Modi, Pertech Computer Limited, India Network Limited, etc. Over the years, certain Indian companies started assembling these in India. These were first manufactured in Japan by the companies like MINOLTA, OPTONICA, MITSUBISHI-just to name a few. Different features and different forms of parts are attached to these type-writers to type formats, master sheets, mathematical and the scientific formulae. There are special purpose type-writers which are used for typing mathematical and scientific formulae and also for typing a special number of literatures.
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