The hatch graph is a device used for technical drawing and graphics, useful for drawing parallel lines at regular intervals. It is a sliding ruler connected to a vertical rod which, by means of a small push-button device, allows it to be moved in uniform jerks whose width is established by adjusting a knob. The possibility of adjustment varies between a few tenths of a millimeter up to 5-6 millimeters, to perform hatching of greater width it is sufficient to set a submultiple of the desired size and repeat the pressure on the button. There are different shapes: in wood and metal or plastic material. The ruler is made of transparent plastic material, between 20 and 30 cm long. Using special attachments and removing the ruler, it is possible to apply perforated masks with graphic designs and repeat them in sequence.



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Source of the text: "http://it.wikipedia.org/wiki/Tratteggigrafo"
Photo: Martino Sanna - Archweb.com
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