Agricola, Georgius
,
De re metallica
,
1912/1950
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1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
511 - 540
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571 - 600
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<
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<
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pagenum
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142
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measurement become a greater length than it should be, he sets upon the
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instrument a standing plummet level, the tongue of which, if the instrument
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is level, indicates no numbers, but the point from which the numbers start.</
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<
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70
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<
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>COMPASS. A, B, C, D, E, F, G ARE THE SEVEN WAXED CIRCLES.</
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<
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>When the surveyor has carefully observed each separate angle of the
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tunnel and has measured such parts as he ought to measure, then he lays
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them out in the same way on the surveyor's field
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20
<
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in the open air, and again
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no less carefully observes each separate angle and measures them. </
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>
<
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>First of
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all, to each angle, according as the calculation of his triangle and his art
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require it, he lays out a straight cord as a line. </
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>
<
s
>Then he stretches a cord at </
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>
</
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>
</
chap
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</
body
>
</
text
>
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