-17-
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:
Summary of Contents for C300
Page 1: ...SURVEYING INSTRUMENTS C300 C310 C320 C330 自動レベル Automatic Level 取扱説明書 OPERATOR S MANUAL ...
Page 26: ... 22 メモ ...
Page 51: ... 23 MEMO ...
Page 52: ... 24 MEMO ...
Page 53: ... 25 MEMO ...
Page 54: ... 26 MEMO ...
Page 55: ......
Page 56: ...第 4 版 05 0806 4th ed 05 0806 Printed in China 2004 SOKKIA TOPCON CO LTD ...