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For instance, 23h 59m 59s on 30 June, 1992 was followed by 23h 59m 60s, which preceded – rather than coincided – with 1 July, 00h 00m 00s. Watch out, because from that date on, your birth certificate showed you younger than your true age. Well, well, if one single second may not seem worth worrying about, it still symbolizes a dream come true, doesn’t it? The world’s first time related document is the Jewish calendar of 3761 BC, but only in the 26th century BC appear the implements for subdivision of the length of day, such as shadow staffs, pillars, and later obelisks and Chinese sundials.

7. Protractor most protractors scales show clockwise markings too. The Carpenter’s Bevel (Fig. 8) is a combination of a precision protractor with an adjustable T-square. Good quality bevels have the scales on ruler and protractor engraved rather than imprinted. The pivoted crossbar is set at the desired angle and held there by a lockscrew. Likewise, the ruler is locked in place with the screw lock assembly that shows in Fig. 8 inside the semi-circular cutout of the protractor. Special applications include tracing other than 90 cuts, and depth measurements.

Fig. 10. Digital theodolite 34 2 Angles and arcs Those gradated disks are oriented at right angles to each other and have their shafts linked to a pair of friction wheels (rollers), which touch and are driven by the rubber ball. This way, the rollers sense the space and direction of the ball’s rotation, and herewith the displacement of the mouse in the x and y directions. It all sums up to a couple of rotary encoders, driven by the displacement of the mouse on the mouse-pad; the mouse-pad acts as a rack and the ball as the matching pinion.

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