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For drawing circles with a large radius, which of the following tool is used?

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For drawing circles with a large radius, which of the following tool is used?

(a) Bow compass

(b) Lengthening bar compass

(c) Divider

(d) Protractors

This question was addressed to me in an interview.

The above asked question is from Drawing Tools and their Uses in portion Drawing Instruments, Sheet Layout & Free-Hand Sketching of Engineering Drawing

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The correct option is (b) Lengthening bar compass

The best I can explain: In a lengthening bar compass, there is a provision for increasing the radius of the circle greater than the total open length of the compass. This helps in drawing very large circles with the help of medium sized compasses.

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