STANDARD - Survey Instrument Antique Center!
STANDARD - Survey Instrument Antique Center!
STANDARD - Survey Instrument Antique Center!
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
The Open-Frame Protected Vertical Circle with the Customary<br />
Face Graduation.<br />
For Transits used in Surface and Mine <strong>Survey</strong>ing.<br />
Attachable to Transits sizes No. 1, 2, 3, 4, 5, 6 and 7.<br />
The aim of this device, which is<br />
similar to that of our glass-protected<br />
edge graduation with open frame,<br />
page 198, is to place the same refinement,<br />
as regards protection from<br />
dust or water, upon the vertical graduations,<br />
as with that on tho horizontal circle,<br />
when such is desirable for the highest class<br />
of work. All of these devices tend to increase<br />
the efficiency and life of a graduation, but<br />
at the same time complicate an instrument<br />
and add a little to the weight c-f the upper<br />
part.<br />
Made to order only.<br />
Price of protected vertical circle<br />
with open frame, as in cut, but<br />
with only one double vernier reading to minutes at eye-end, glass-covered, see<br />
Heliotrope page 198, extra over price of Transits enumerated with full<br />
vertical circle, size Nos. 1, 2, 4, 5 and 6 $3O.OO<br />
Price extra over Mining Transit No. 6D 15.OO<br />
Price of protected vertical circle as in cut, with tico double opposite verniers, glasscovered,<br />
extra over price of transits Nos. 1, 2, 4, 5, 6 and 7, when enumerated<br />
with a regular full vertical circle . $4O.OO<br />
Price of protected vertical circle with open frame as above, extra for Transit<br />
No. 6D 25.OO<br />
Price of reading-glasses if desired for double opposite verniers, extra 1O.OO<br />
The Level to the Vernier Frame of Protected Vertical Circle.<br />
This feature, which greatly facilitates<br />
the reading of vertical angles<br />
without requiring the instrument to<br />
be leveled up accurately, can be added<br />
to any of the foregoing styles of protected<br />
vertical circles, when so ordered<br />
with instrument.<br />
As will be seen, the level is placed upon<br />
the vernier frame, which latter has a spring<br />
tangent screw by which the bubble can be<br />
readily brought to the center of its tube.<br />
When properly adjusted to the instrument,<br />
the bubble is required to be in the center<br />
when the zeros of verniers and vertical circle<br />
are in coincidence, and when the telescope<br />
is in a horizontal position.<br />
Made to order only.<br />
Code word*<br />
Hestula<br />
Hesmlil<br />
Hesudra<br />
Hesydo<br />
Hetarda<br />
Price of level w ith tangent screw attached to any of the foregoing protected vertical<br />
circles, extra $12.OO Hetesy
Change language