STANDARD - Survey Instrument Antique Center!

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191
Fig.
9. Leather ease with shoulder straps. For
prices see page 188.
Fig. 12. Plumbing Device A and B for carrying a
meridian or surface line down a shaft by
the plumb-line method.* Fig. 14.
Fig. 13. Lateral adjuster attached to tripod with
transit mounted upon it for ranging transit
on to given line. For description and
method of application see page 205.
Fig. 14. Shows in graphical manner the method of
carrying a line down into the shaft by
means of the plumbing devices and lateral
adjuster.
* For valuable suggestions in carrying out the
perfection of this device we are indebted to Mr.
G. H. Potter, M. E., of Butte, Mont.
The Berber Patent Mine Tachymeter.
ftAN OF SHAFT AT COLLAR
VERTICAL SECTION THROUGH SHAF1
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