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1. INTRODUCTION
Models 6850-7 and 6850-8 Manual Sighting and Reading Tables is a manual measurement
device for detecting and measuring the horizontal displacement, inside a dam embankment, of a
pendulum wire relative to the station inside the dam embankment at which the sighting device is
mounted. The maximum range of the device is ±25 mm in two horizontal orthogonal directions
X and Y. The sighting device can either be secured to a wall with a bracket or mounted to a table
fixed to the floor depending on the space limitations of the station location.
The Manual Sighting and Reading Table consists of a base plate on which is mounted two steel
rule, reading scales and two sliding sighting devices. By moving the two sighting devices over
the reading scales they can both be aligned in such a way that, when looking through the hole in
each sliding device, the pendulum wire lines up with one of the front sights. In this position, the
two values on the underlying scale can be read and entered into the Pendulum Collimation
Software to yield the X and Y coordinates of the pendulum wire.
2. INSTALLATION
Figure 1 is a dimension drawing indicating the location of the mounting holes of Manual
Sighting and Reading Table. There are four mounting holes on the plate. The hole spacing is 256
mm × 95 mm (10.07 × 3.74 inches). Four stainless steel bolts are included in both metric (M8 ×
20 mm) and standard (5/16"-18 x 1.25") sizes. Also included are four nuts, four flat washers, and
four spring washers.
front sight (B）
front sight (A）
Mounting holes
（ place）
Line（Origin）
Sliding Sighting
(A1)
Sliding Sighting
(B1)
：
Unit
mm
Figure 1 - Plane Dimensions Drawing of Manual Sighting and Reading Table
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