Workshop Technology
Scribing block is used to

Locate the centres of round bars
Check the trueness of flat surfaces
Hold the round bars during marking
Check the surface roughness

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Workshop Technology
Riddle is used for

Reinforcement of sand in the top part of moulding box
Smoothing and cleaning out depressions in the mould
Cleaning the moulding sand
Moistening the sand around the edge before removing pattern

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