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7.3 RETICLE CROSS-LINE (LINE OF SIGHT)
1) Set the instrument halfway between two points, A
and B, 30 to 50m apart. Take readings a1 and b1.
(Fig.7.5)
Fig.7.5
2) Set the instrument at a point 2 m from point A.
Take readings a
2
and b
2
. (Fig.7.6)
Fig.7.6
Leave the telescope sighted on point B.
Calculate
b
2
’ = a
2
- (a
1
- b
1
)
If b
2
’ = b
2
, the horizontal cross-line is
normal and no adjustment is necessary.
When b
2
’ and b
2
are different, adjust
the cross-line as follows:
Содержание C300
Страница 1: ...SURVEYING INSTRUMENTS C300 C310 C320 C330 自動レベル Automatic Level 取扱説明書 OPERATOR S MANUAL ...
Страница 2: ...SURVEYING INSTRUMENTS This is the mark of the Japan Surveying Instruments Manu facturers Association ...
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Страница 56: ...第 4 版 05 0806 4th ed 05 0806 Printed in China 2004 SOKKIA TOPCON CO LTD ...