WILD DRAWING INSTRUMENTS FREE
Neat continuous curve is finally drawn with the longest possible curve coinciding exactly with the free hand curve. A light pencil curve is first drawn free hand through the known points.
This adjusting nut is provided to make fine adjustment for accurate small circles.įrench Curves – French curves are used to draw irregular curved lines, which cannot be drawn with a compass. The adjusting nut of the small compass may be on the side or at the centre. It is very handy when a number of small circles of the same diameter are to be drawn. Small Bow Compass –Small bow compass is conveniently used for drawing circles and arcs of small diameters. For drawing smaller circles, both the legs should be bent at the knee joints so that these are perpendicular to the surface of the paper. Circles up to about 120 mm diameter can be drawn with the legs of the compass kept straight. Both the legs are provided with knee joints.
The lower part of the pencil leg is detachable and it can be interchanged with a similar piece containing an inking pen. A pointed needle is fitted at the lower end of one leg, while a pencil lead is inserted at the end of the other leg. It consists of two legs hinged together at its upper end. Large Size Compass – The compass is used for drawing circles and arcs. A good combination of set-squares is 30 O x 60 O set square with a long edge of 250 mm and a 45 O set squares with each edge of 200 mm. These are used for drawing short straight lines, measuring and drawing certain angles. Set-Squares –Set-squares are made of transparent plastic and are available in the shape of triangles, having a French curve or simply a gap cut in the body. T- Square is used for making horizontal, vertical, inclined or parallel lines on the drawing sheet. The head also has an ebony edge which slides against the working edge of the board. It is made of mahogany or pear wood, which is harder than the board wood. T- Square – It is composed of a long strip called blade, which is screwed rigidly at right angle to a shorter piece called head or stock. It helps to erase unwanted pencil lines without erasing the surrounding lines. Use of eraser should be minimized by proper planning.Įrasing Shield –It is a thin metal or plastic plate cut with slots, circles and curves of different dimensions. The rubber crumbs formed after erasing should be swept away with a clean duster and should never be brushed off with hands. It is desirable to use erasing shield to protect the nearby lines from being erased. The eraser used should be such that the surface of the drawing paper is not spoiled in anyway. Soft India-rubber is the most suitable kind of eraser for pencil drawings. Adhesive tapes are also used for fixing the drawing sheet.Įraser –Eraser is used to remove the extra lines, lines/marks drawn by mistake and to clear soiled spots on the drawing. Clips are used at all the four corners of the drawing board to clamp the paper. The present trend is to go in for steel clips, if the size of the drawing paper is the same as that of the drawing board. Frequent use of pins cause formation of impressions of pin pricks on the board, thus spoiling the surface of the board. Micro tip pencil – 0.5mm for drawing outlines and 0.8mm for shading and sketchingĭrawing Clips or Pins –Drawing clips or pins are used to fix the drawing sheet on the drawing board at the required place. H Pencil – For dimensioning, arrowheads, hatching lines, lettering, sketching, circles, arcs, etc. Following pencils should be used for drawing work in class:ĢH Pencil – For drawing outlines, Centre lines, Break lines, etc. The choice of grade of pencil depends upon the type of work, texture of paper, atmosphere, humidity, etc. Harder pencils have leads of small diameters and softer pencils of larger diameters to give adequate strength. Pencil of 9H is the hardest and that of 7B is the softest.
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