STANDARD - Survey Instrument Antique Center!

205
Patented.
The Berger Lateral Adjuster
For Transits with FOUR leveling screws.*
For use on tripods aiicl trivets.
The Lateral Adjuster shown above is an attachment, made of brass, separate from
the Engineers' Transit and its tripod. It screws to the tripod and then the instrument
is screwed on top of it. It is designed to range the line of sight of a Transit after
it has been leveled up, quickly and accurately onto a given line which may be indicated
by the plumbing wires A and B in a shaft, as shown in a graphical manner on
page 191, or onto a line given by any two station points in a tunnel or in surface
work, without disturbing the position of the level bubbles.
Being primarily intended for underground work the indicator wheel of the feed
screw may serve as an aid in moving the instrument a required distance in the dark
in ratio of hundredths and thousandths of a foot.
TO OPERATE THE LATERAL ADJUSTER. Screw it firmly to the tripod
and also attach Transit to it. Place both index marks of the Lateral Adjuster in
coincidence, and also place Transit about in the center of its shifting motion. Then
place tripod firmly on the ground in such a manner that the longitudinal axis of the
Lateral Adjuster is approximately at right angles to the line given by the plumbing
wires A and B, and at the same time that the line of sight shall be as nearly in line
with these wires as possible. Now level up carefully and move the line of sight of telescope
on to wires A and B by the feed screw of the Lateral Adjuster until the intersection
of the cross-wires of the telescope and both plumbing wires are contained in
the same vertical plane. When Trivets and Lateral Adjusters are ordered for old
instruments the serial number must be given.
Lateral Adjuster for transit No. 4 with four leveling
screws, see large cut above
This lateral adjuster provided with detachable trivet
Topadil, see page 204 2 Ibs.
This lateral adjuster provided with detachable trivet
Topalate
Lateral Adjuster for transits No. 1, 2, 3,5, 6 and 11,
see large cut above
This lateral adjuster provided with detachable trivet
Topana, see page 204 ,
This lateral adjuster provided with detachable trivet
Topalis 4 Ibs. 7
This lateral adjuster provided with detachable trivet
Topaxset 6 Ibs.
This lateral adjuster provided with detachable trivet
Topazula 8 Ibs. 7 oz.
Lateral Adjuster and Trivet Combined f see small cut
above for transits Nos. 1, 2, 3, 5, 6 and 11
(when latter is provided with four leveling screws.). . 4 Ibs. 5 oz.
Lateral Adjuster and Trivet Combined, same as Topixdil
but with an adapter for use with transit
No.4
Lateral Adjuster and Trivet Combined,! same as Topixdil
but with instrument fastener for transits
Nos. 1, 2, 3, 4, 5, 6 and 11 with three* leveling
screws . . .
* For transits with three leveling screws, see Tunnel Tripod with centering and aligning device,
page 210.
tThis device is to be placed upon the regular tripod head of our transits Nos. 1, 2, 3, 5, 6
and 11, when these are ordered to be provided with THREE leveling screws, or it may be
used independently on a bracket. As will be seen above there is also provided on top the instrument
thread for attaching transits Nos. 1, 2, 3, 5, 6 and 11 having four leveling screws, so that all
the above styles and sizes of instruments having either three or four leveling screws may be used
interchangeably on this three-screw tripod. It is of great advantage when a variety of instruments
are to be used on the same work.