Methods of surveying (right) and time keeping (left). On the left are various different kinds of sundials and a clock with a single arm. On the right a survey is being made of the height of the tower, using quadrants and, on the far right, a cross staff. From Sebastian Munster 'Rudimenta Mathematica', Basle, 1551. Woodcut.

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Methods of surveying (right) and time keeping (left). On the left are various different kinds of sundials and a clock with a single arm. On the right a survey is being made of the height of the tower, using quadrants and, on the far right, a cross staff. From Sebastian Munster 'Rudimenta Mathematica', Basle, 1551. Woodcut.

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