STANDARD - Survey Instrument Antique Center!

166
C. L. BERGER & SONS. BOSTON
5|"
MONITOR TYPE
Engineers' and Surveyors' Transit
With Compass. Cylindrical Pivots to Telescope Axis. Wye-Bearings.
A Standard Size of less weight than transit No. 1 , but larger than sizeNo.2.
In general use for accurate WOl'k in cities where commercial traffic prevails, in
and about factories and erection of buildings. For underground work it has .no supe-
1
rior. The telescope has nearly the same power as No. 1 Erecting
and when
made Inverting' is more powerful. Modern design, ruggedness of construction,
and its great lateral rigidity of standards for steadying the telescope's
axis place this style on a par with our Yoke Standard Frames,
enumerated later on, commending it to all requiring uninterrupted and efficient
service in strenuous work.
The outer or contra clockwise row of figures on the horizontal circle and those of
the verniers of the right side of verniers A andB can be furnished in Red but will be
made to order only, see cat. page 41. Instrument stands upright in carrying case.
Monitor Transit, Size No.
SPECIFICATIONS :
Horizontal circle 5^ iiicli (at edge of graduation), graduated on heavy
ring of solid silver, double* opposite verniers, read to minutes, two rows of
figures to 360 in opposite 'directions; figures inclined in the direction
verniers should be read, verniers at 30 degrees to line of sight.
Vertical arc 5-iiich, graduated on solid silver, double verniers read to minutes.
Telescope lO^-incli, objects erect, i aperture l^-inch, power 2O dia.
Stadia wires, fixed, in ratio 1 : 100.
Spirit level 5 >2 -inch, with clamp and tangent screw to telescope.
Plate levels of standard length and very sensitive.
'Magnetic needle 3>-incIi, edge-bar form. (See pages 98-99.)
Shifting" center, to set instrument exactly over a given point.
Punch mark on top of telescope, to enable to center the transit from a point above.
Transit leatherized (see page 9). All important parts treated in our durable
and handsome leather finish.
Full length split-leg- tripod.
The Mahogany case has a leather strap, hooks, etc. It contains a sun-shade,
a wrench, a screw-driver, an adjustable plumb-bob, a magnifying glass, an adjusting
pin, and weighs about 7 Ibs.
Weight of transit about 13 Ibs.; weight of tripod from 9 to 9)4 Ibs.
Gross weight of transit packed securely for shipment in two boxes, about 55 Ibs.
Code word Caboa Price, $243.OO
Transit as above, but in place of arc with a 5-inch full Vertical Circle
of standard.
and Aluminum Guard double verniers between legs
Code word Cafid
Extras to Monitor Transit No.
Price $252.OO
Graduation of Horizontal Circle, reading to 30"
. Gradienter attachment ?
. Offsetting arrangement ...
Variation Plate, adapted for all declinations E. or W. '
' '
.
,'...
in en
Extension Tripod, in addition to the split leg tripod furnished with the transit .
Plain Prism, with colored glass, for observing the sun's altitude (fig. 7), page 175 . 8.00
Improved Prism, with colored glasses, for observing the sun's altitude (hg. 5), page 175 12 .uu
Davis' Solar Attachments, screen with improved prism mounting (p. 175)
Berber's Solar Attachment (small) (pp. 172 and 173) o2.w
Latitude Level Attachment
. Short Focus Lens Attachment (see pages 101, 203) One $8.50, pair
Leather Cover over case arranged to be strapped to a saddle of a horse . .
it-yv
" " "as above with shoulder .
straps V'XX
Cravenette hood (heavy, gives good protection), silk (light, not waterproof), each . i.w
Bottle of fine watch oil, for the centers, etc., of transit .....
"This transit can be furnished with a single B vernier, see Monitor Type transit No. 4 1 A,
page]180. Made to order only.
t An Inverting Telescope of 1/4" aperture, Id/a" long, Ppwer 23 dia. ^n be supplied
with the above transit in place of the regular erecting one at no additional cost. J
particularly well adapted for stadia work. Made to order only.