5. a) Enumerate briefly the precautions to be observed in the use of the ruling 



pen. 

 b) How would you test a triangle for accuracy ? 



6. The accompanying full-size drawing shows three projections of a 1| inch cube 



from which three cavities have been cut. State the length, width, and 

 depth of each cavity, as determined by direct measurement from the drawing. 



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H 



