STANDARD - Survey Instrument Antique Center!

175
C. 1. BERGEK & SONS.
Fig. 2. Fig.l Fig. 3.
Solar Screen
Daisy
Fig. 4.
Glass
mounted in
Cap.
Dandelion
Plain Prism
with colored glass
Attached to Eyepiece Cap.
NOTE.
A diagonal Eyepiece cannot be
advantageously attached to a
mine transit, since it must interchange
with the regular eyepiece
of the inverting kind, and therefore
frequent breaking of the cross
wires from dirt and water would
be a constant source of annoyance,
especially in dark places. Beside
such instruments the telescope must I
pushed considerably farther through
axis and a heavy counterpoise permanently
attached to the eye-end of barrel to balance
Davis* Solar Attachments,
Attachable to any of our
Transit Eyepiece Caps
the telescope, and the latter will then only reverse at eyeend
through the standards. For sights inaccessible to the
main telescope in mine work, nothing better has been
introduced than our interchangeable auxiliary telescope,
described later on.
Fig. 6.
Glass
mounted in
Shutter.
Daorma.
Fig. 5.
Dahlia.
Berger Improved Prism and colored glass attachment
" A "
Prism, " B "
Peephole, " C "
Colored Glasses.
Fig. 8.
Diagonal Eyepiece with Swivel Adapter
for Zenith Stellar Observations
applicable only to
Inverting telescopes of
Transit-Theodolites
Zenith Price, $20.00