The T-square is used in conjunction with drawing board;
-
As a guide for drawing
horizontal lines only
-
For guiding the triangles or
set squares when drawing vertical or inclined lines
Parts
-
Head: normally held against the edge of
the true working edge (stock) when in use.
-
Blade: This carries only one true
working edge. The blade either tapers away from the head or is made with
parallel edges.
Sizes
-
A0- 1270mm
-
A1- 920mm
Materials
for construction
-
Wood
-
Plastic
-
Metal
The best T-squares are made from hardwood
fitted with ebony or clear plastics.
Special
Qualities
1.
When engaged with the true
working edge of a drawing board, a good T-square should provide an accurate
right angle.
2.
The true working edge should be
bevelled or stepped to avoid smudging or ink blotting.
3.
The underside of the blade
should be polish-finished (very smooth) to facilitate movement over the drawing
surfaces.
4.
For tapered blades, the tapered
edge is better rounded off.
Care
of the T-square
1.
Due to the small cross-section,
the T-square is usually liable to fracture. Therefore, it should not be kept in
a bridging position or leaning against the wall.
2.
It should be kept flat or hung
on pegs when not in use.
3.
Fixing between the head and
blade should always be firm and not loose and shaky
4.
The working edge should not be
used as a straight edge for cutting to prevent indentations
5.
The underside of the blade
should always be cleaned by periodical wiping with soft cloth and a few drops
of spirit.
*Water
is not a good solvent and should not be used in the case of a wooden T-square.
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