STANDARD - Survey Instrument Antique Center!

4|"
180
C. L,. BERGER & SONS. BOSTON
MONITOR TYPE Transit.
With Compass. Cylindrical Pivots to telescope axis. Wye- Bearings.
This Monitor Type transit has been designed to meet a demand for a
lighter instrument than size No. 5>^ Monitor Transit.
The same general description of our No. 5H Monitor Transit, page 166, applies
to this No. 4:}^ Type with the exception that vernier B is single, which enables
US to place an unusually long, sensitive and fully protected front plate level 011
this small transit and does not project over the vernier plate. We do not furnish a
double B vernier. On just this one feature alone this type With the double A
vernier and the single B vernier is destined to supersede the regular types
made, as it lessens the tendency toward errors. In general practice a reading: on a
Berg'er transit is at once accurate and sufficient. However, if the A and B double
verniers are wanted we advise ordering No. 4^ transit on page 179.
The outer or contra clockwise row of figures on the horizontal circle and the
corresponding figures of the right side of vernier A can be furnished in Red but will
be made to order only, see cat. page 41. Instrument stands upright in carrying case.
Monitor Transit No. 4,
SPECIFICATIONS :
Horizontal circle 4%-inch, graduated on heavy ring of solid silver. A vernier is double.
B vernier Is single reading to minutes, two rows of figures to 360 in opposite directions.
Figures inclined in the directions verniers should be read : Verniers at 35 to line of sight.
Vertical Arc 4-inch, graduated on solid silver, double verniers, reading to minutes.
l
Telescope 8-inch, objects erect,* aperture l /& inch, power 19 diameter.
Stadia wires, fixed, in ratio 1 : 10O.
Spirit level 4-inch with clamp and tangent screw to telescope.
Plate levels both of standard length and very sensitive.
Magnetic needle 2fi inch edge-bar form having no index error.
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 leather finished.
Extension tripod. t
The Mahogany case has a leather strap, hooks, etc. It contains a sun-shade, a wrench, a screwdriver,
an adjustable plumb-bob, a magnifying glass, an adjusting pin, and weighs about 4 Ibs.
Weight of transit about Q% Ibs. ; \veight of extension tripod about 9 Ibs.
Gross weight of transit packed securely for shipment in two boxes, about 50 Ibs.
Code word Geminol.
Price $1
Monitor Transit No. 4V as above, but with 4" full Vertical
circle and aluminum guard in place of arc.
Codeword Genony. Price
Extras to Transit No.
Gradienter attachment
Variation plate to set off all declinations E. or W.
Prism and colored glass (plain form only permissible, Fig. 7, page 175)
Reflector for illuminating the cross wires
Short focug lens, pages 101, 203, one
Edge graduation for vertical circle, with a double vernier at eye end, page 198
Edge graduation for vertical circle, with double opposite verniers, page 198
Patent interchangeable auxiliary teles'cope, style I, page 189
Berger solar attachment with small telescope, page 172
Split-leg tripod in addition to extension tripod furnished with the transit .
Bracket in box, page 203
Trivets, page 204 ....
Lateral adjuster, page 205 .
Leather cover with shoulder
"
straps
without
Hood to protect transit from rain and dust
, Bottle of fine watch oil .
* 5.00
10.00
8.00
4.00
8.50
35.00
45.00
37.0O
58.00
16.50
14.00
25.00
13.00
11.00
1.00
.35
*An Inverting Telescope of l'/8 "
aperture, TtVa" long, power 18 dia. can be supplied
with
the above transit in place of the regular erecting one at no additional cost. This telescope is particularly
well adapted for stadia work. Made to order only.
t We furnish with this instrument a heavy extension tripod, such as furnished with transit size No. 2.
This secures to the transit the necessary great rigidity and stability. However, when required, we
can furnish an extension tripod weighing 7 Ibs. only (price being the same), in place of the 9M lb.
tripod, or in addition if desired for special purposes. We can also furnish the stiffer split-leg tripod
weighing only 7^4 Ibs. in place of the extension tripod. This we recommend very strongly whenever
applicable.