STANDARD - Survey Instrument Antique Center!

The
190
See M
Fig. 1.
Berger Patent Mine Tachymeter Nos. 4, 4 1 > and 6.
With Style I Patent Interchangeable Auxiliary Telescope (pages 97 and 193).
ming Transits, sizes 4 and 6, pages 97 and 193. For price of instrument and extras, see pages
182 and 188.
General arrangement of instrument showing upright
reflector attached to object-glass.
post for auxiliary telescope, and a
Fig. 2.
Fig. 3.
Fig. 4.
Interchangeable auxiliary telescope; Fig. 7 its counterpoise.
Auxiliary telescope at side when measuring vertical angles', also for making latitude observations
(see page 97), when sun is too high for observations with the main telescope.
Auxiliary telescope attached to vertical post for use as top telescope when measuring steep
horizontal angles and when surface or meridian lines must be carried down a shaft wh^n
objects cannot be seen by main telescope, as well as for time observations when sun is too
high for observation with the main Fig.
telescope.
5. Side telescope placed parallel Fig. 6.
Fig. 8.
with the main telescope in emergencies by means of the striding
level: also showing manner of centering from point above.
Patent short focus lens attached to main telescope, p. 100.
Patent Disappearing cross and stadia wires; inclined wires indicating center for stadia wires,
for erecting telescope, p. 122. Continuation on page 191.