STANDARD - Survey Instrument Antique Center!

18
134
II
ENGINEERS' WYE LEVEL.
leveling Instrument of Precision.
For Fine Bench Leveling, Water-works, Railroad Construction, etc.
Instrument has the strong, liollow and long" cross-bar, introduced by us in
1871, mounted upon which are the wyes supported by adjust ing nuts of large diameter,
which, together with the long" center also of larjre diameter, gives the necessary
stability to withstand rough treatment. To secure compactness the telescope and
level tube are close together (to protect latter from sun and rain), and, as both are
close to the cross-bar, the instrument is steady in a strong wind. To ensure permanency
of adjustment, the telescope and level mounting tube have our leather finish (see
page 11), which treatment enables us to combine many parts into one, that would have
to be screwed together, thereby securing not only great rigidity, but reducing to a minimum
the effect of sudden changes of temperature, and affording, a degree of satisfaction
in the field, secured in no other way. This finish presents a fine appearance and
is more durable than a metal finish. As much depends upon the sensitiveness of the
spirit level we select this for the character of the field work, and, therefore, it ranges
in value in this style of instrument from 10 to 20 seconds of arc to one tenth of one inch
of scale.
SPECIFICATIONS:
Telescope. Objects erect, aperture 1
3/ 8 inch, power 35 dia. Focussing slide*
very long and protected by dust guard. Collars hard bell metal and of large
diameter.
Eye-piece with large flat field of view, provided with an improved screw arrangement
permitting to focus the wires by simply turning its head slightly to right or
left. Line of collimation correct for all distances. Telescope balanced each
way from center when focussed for a mean distance with sunshade attached, to
secure highest accuracy attainable. Stop provided so that the cross wires will
always be horizontal and vertical in instrument.
Spirit- Level 8)6 inch (between centers of supporting arms) level vial accurately
ground to a true curvature and barrel shape.
Center liard bell metal (very large in dia. and long, strong and unyielding).
Mahogany box, provided with strap, lock, and hooks, contains sunshade, wrench,
screwdriver and adjusting pin.
Weight of instrument, 11 Ibs. Weight of tripod, about 10 Ibs.
Gross weight, securely packed for shipment in two boxes, about 55 Ibs.
Code word Adlumia. Price, as above, $ 14O.OO
Extras to Engineers' 18" Wye Level.
Steel center running in a socket of cast iron, to insure freest motion with
perfect fit. (See cut on opposite page). ...... 815.00
Stadia wires, fixed . ........ 3.OO
Short focus lens (see pages 101, 203), one $8.50 . . . .pair IG.OO
Fine mirror with universal joint readily attachable to either side of the
instrument, facilitating the reading of the bubble without stepping aside 10.00
TCxtra sunshade with smaller aperture, for use with the 18-inch wye level
when the sun's rays are too bright for accurate work .... 1.50
Gossamer water-proof hood to protect instrument from rain or dust . . l.oo
Bottle fine watch oil, to lubricate the level center . . . . . .35
14 ENGINEERS' WYE LEVEL.
Its essential features are like those enumerated above, and shown in cut of eighteen-inch
Engineers' Wye Level, with the exception of size and weight. It is designed
for use where a lighter instrument is desirable. The Telescope has an
aperture of 1 % inches and a power of 27 diameter. The 5^ inch spirit level
is very sensitive. The center is of bell metal. Full length, split-leg tripod.
Weight of instrument, about 9^ Ibs; weight of tripod, 5^ Ibs.
Gross weight of instrument, packed securely for shipment in two boxes, about 40 Ibs.
Code word Alyssum.
Price, as above $13O.OO