Drawing Lesson 1- Instruments
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Transcript of Drawing Lesson 1- Instruments
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DRAWING
City and Guilds
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200.104 Identifying Drawing Instruments
IDENTIFY INSTRUMENTS AND EQUIPMENTUSED FOR THE PRODUCTION OF GOOD
QUALITY DRAWINGS
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PENCIL
Number ranging from 2B to 2H.
Letters refer to the hardness of the pencillead.
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DRAWING PENCIL TYPES
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PENCIL CHOICE
When sketching (quick drawings and
shading)a soft lead such as 2B is can be used
When drawing precisely a 2H or even a harder
pencil such as a 4H is ideal
The harder type of pencil keeps its sharp edge
for longer and produces very fine lines.
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REFILLABLE PENCIL
Useful especially for constructing a drawing that needsa constant thickness of line.
The refills are available in a range of thicknesses andeither hard or soft leads.
Disadvantages are that the refillable pencils arerelatively expensive
Also, the leads tend to break more easily
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PROTRACTOR
A protractor is used to measure angles.
A typical protractor is a semi-circular piece ofplastic with 180 degrees printed around its curve.
also used in subjects like Mathematics
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COMPASS
A compass allowing the drawing of circles
The drawing shows a bow compass, this is used fordrawing small circles very accurately
Cheap compasses tend to slip on the paper and breakquite easily.
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T-SQUARE
T-Squares are use to draw horizontal lines
useful when constructing accurate orthographic drawingsor architectural drawings
A T-Square is normally used with a drawing board, setsquares and clips
It must be pushed firmly against the edge of the drawingboard when it is being used
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SET SQUARE
Set Squares are used to draw accurate angles
The most common are 45 and 60/30 degrees
When using set squares they should always used along witha T-Square
The Set-square rest on the straight edge of the T-Square
this ensures that the angle drawn is accurate
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BOARD CLIPS
Board clips are used to hold the drawing paper in
position. They simply clip on to the board holding
the paper firmly against the drawing board
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SET SQUARE T-SQUARE AND CLIPS
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RULER
A ruler used to measure distances with lines beingdrawn with T-Squares and Set Squares
Most people use rulers to draw straight lines
But it must be remembered that the edge of a ruler isnot guaranteed to have a perfectly straight edge unlikea good T-Square or Set Square.
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DIVIDER
Divider is used to transfer a measured gap toanother point on a drawing
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