STANDARD - Survey Instrument Antique Center!

184
The 4"
Complete Transit- Theodolite No. 4b.
With Yoke Standards and Wye-Bearings. Without Compass.
Size as in No. 4, page 182.
For triangulatioii, filling- in details, etc., in secondary triangular
tioii, also for explorers, engineers and surveyors where the large instruments
described under No. 11, etc., become undesirable on account of their size and weight.
The Yoke Standard frame is of our advanced pattern, cast in a single piece
of aluminum * (unless ordered to be of brass composition), to gain great lateral stiffness,
and is leatherized. The inverting telescope can be reversed over the bearings by
turning the upper covers aside, and also in the usual way through the standards. The
graduation of the horizontal circle and its verniers are protected by glass.
If double opposite verniers are desired for the vertical circle the figures will then
run from 0-90-0 and back (as in the regular field instruments), instead of clockwise with
single opposite verniers enumerated below. A level is attached to the vernier arm
(instead of to the telescope as in Xo. 4). This instrument will be made with three leveling
screws only and packed lying down in its carrying case.
Made to order only.
Complete Transit-Theodolite No. 4 b, as in cut on opposite page.
SPECIFICATIONS:
Horizontal circle 4-iiicli (at edge of graduation), graduated on heavy inlaid
ring of solid silver, single opposite verniers read to minutes, one row of figures
to 360; verniers at 90 to line of sight.
Vertical circle 4-iiich, graduated on solid silver, single opposite verniers read
to minutes, one row of figures 0-360 clockwise (unless ordered otherwise).
Compound centers of bell metal.
Telescope 7^-illch, Objects inverting, aperture l 1
^ inch, power 18dia.
in ratio 1 : 100
Stadia wires, fixed,
Spirit level 2^-indl, with reversible clamp and tangent screw to vernier arm
Striding" level rests at points of contact in wyes.
Reading glasses to horizontal and vertical circles.
Plate levels both of standard length and very sensitive.
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.
Standards leatherized (see page 9).
Extension 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 5 Ibs; weight of extension tripod 9 Ibs.
Gross weight of transit packed securely for shipment in two boxes, about 50 Ibs.
Price of Small Complete Transit-Theodolite No. 4b,
as described
above and shown in cut (with extra vertical wires if desired forstellarobservation)
Codeword, Gorastis. $315.OO
Extras to Transit No. 4b.
Compound centers made of steel running in sockets of cast iron to insure freest motion with
perfect fit . . . 20.00
_
Spirit level 4-inch with reversible clamp and tangent screw to telescope (see cut No. 4.) in additions
to level to vernier arm shown in the opposite cut
Plain prism and colored glass ( Fig. 7, page 175)
Split-leg tripod
12.OO
8.OO
in addition to extension tripod (latter furnished with . transit) .
"Leather cover with shoulder straps
" " " "
without
. .
Hood to protect transit from rain and dust
. 16.5O
12.5O
1O.5O
l.OO
Bottle of watch oil .... .35
* If desired, the U-shaped standard frame can be made of brass, weighing about 1 Ib.
more, no extra charge. If instrument is to be used near salt water, brass will prove
more durable for this standard frame, as aluminum and its alloys are apt to be affected
by salt water, saline and alkaline vapors and liquids.