STANDARD - Survey Instrument Antique Center!
STANDARD - Survey Instrument Antique Center!
STANDARD - Survey Instrument Antique Center!
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The Fully Enclosed Vertical Circle with Edge Graduation.<br />
For Transits used only in Mines, Tunnels, etc.<br />
Applicable to Transits No. 4, 5, 6D, 6H, and 7.<br />
In distinction<br />
fo the open<br />
frame form of<br />
the p r o te c t e d<br />
vertical circle<br />
shown in the<br />
foregoing illustrations,<br />
designed<br />
to offer the minimum<br />
resistance<br />
of the exposed<br />
area of a Transit to wind pressure and to prevent<br />
the instrument from being blown over in<br />
surface surveying, we recommend, where a<br />
transit is used only underground, the fully<br />
enclosed type to protect its graduations, as<br />
in the horizontal circle, from dripping water,<br />
and to a great extent also from fumes and gases existing<br />
in mines. The vernier frame shown in this cut is<br />
therefore so constructed that it forms a shell without<br />
any openings except those for the glass-protected verniers.<br />
Two semi-discs, which can be easily removed<br />
whenever desirable, fit into this v ernier carrying shell<br />
at the back, thus encasing the vertical circle completely,<br />
but allowing it to move freely with the telescope. No _<br />
water can penetrate inside this shell at any time while in use, nor when carried on its tripod or in hand, if<br />
caution is taken to carry the instrument so that its front outside surface is slightly inclined in an upward<br />
direction. Made to order only.<br />
Price of vertical circle with edge graduation, as in cut, reading to<br />
minutes, but with only one double vernier at eye-end, glass-covered<br />
Code WovdB<br />
extra over price of Transits !N"o. 4, 5 and G, enumerated with<br />
regular full vertical circle<br />
Price, extra over $35.OO Hestard<br />
price of Transit No. 6D<br />
25.OO Hestene<br />
Price of vertical circle with edge graduations as in cut, with two<br />
double opposite verniers, reading to minutes, glass-covered extra<br />
over price of Transit No. 4, 5 and G, enumerated with regular full vertical<br />
circle<br />
45.OO Hestite<br />
Price, extra, for Transit No. GD<br />
35.OO Hestium<br />
The Fully Enclosed Vertical Circle with the Customary<br />
Face Graduation.<br />
For Transits used only in Mines, Tunnels, etc.<br />
Attachable to Transits Nos. 4, 5, 6, 6D, 6H and 7<br />
In this type the regular vertical<br />
circle and verniers with<br />
a flat graduation (pages 155<br />
and 193) are encased in a shell,<br />
closed at the back by semidiscs,<br />
to protect their graduation,<br />
from dripping water,<br />
etc. In all other respects the<br />
design is similar to that described<br />
above for the edge<br />
graduation: verniers are glass-protected and read t<br />
minutes; glass shades if desired can be added. -<br />
striding level to rest on special collars between standards,<br />
can be attached if desired, but only to Nos. 1<br />
and 5 Transiis. Made to order only.<br />
Price of vertical circle with a flat graduation<br />
as in cut, but with only one<br />
double vernier at eye-en d , glass-covered,<br />
extra over price of Transits Nos. 4,<br />
5, G and 7, having regular full vertical<br />
circle (see m<br />
page 196) $3O.OO<br />
Price extra over price of Transit<br />
No.GD .<br />
. . . 15.OO<br />
Patented.<br />
Hestmos<br />
Hestnia<br />
Price of vertical circle as in cut, with<br />
two double opposite verniers, glass<br />
covered, extra over price of Transits Nos. 4, 5, G and 7, having regular<br />
full vertical circle, $4O.OO Hestota<br />
Price extra for Transit No. GD 25.OO Hestra
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