The levelling staff (3) is then locked by the stopping device (13).

The outer tube (2) is then moved with the levelling staff (3) along the inner tube (10) until the levelling staff (3) is at the right vertical position.

This method uses test objects connected or not connected to the user's face.

Also provided are a method for using the test chart, and a chart board and a test device provided with the test chart.

The test chart for the solid-state imaging device is provided with a circular or concentric annular chart figure with lightness different from that of a background.

Process to correct distortion of radiological images by obtaining the image of a regular test chart and assessing the distortions to which the image is subjected.

1 chart Standardized test chart published by ITU-T for document facsimile transmissions.

A test chart (110, 170) containing a representation of the test pattern image is next imaged using the imaging device (120, 160) to form a second image (1010).

A test pattern projected on a wafer (W) through a projection optical system (PL) is provided on a focus test pattern.

At least one embodiment of a method includes creating a test pattern for testing video functionality of the STT, sending the created test pattern to a digital encoder, and converting the test pattern to an analog signal.

The test patterns are continuously read out from the FiFo memory (22) in synchronism with the pattern generation clock pulses (PCK).

The correction values result from an evaluation of the position error of pattern centres of an optical test pattern restored by the camera and of their homologues in an electronic test pattern.

A gray scale test pattern is also displayed on the electronic camera CRT screen (22) and the electronic camera test pattern is photographed using film (15).

The elements that make up the bar code graduation form closed lines on the outer surface of the measuring staff and lie in a cutting plane perpendicular to the longitudinal axis of the measuring staff.

A geodesic measuring staff with a bar code graduation has a body with a cross-section that is substantially symmetrical about an axis.

The invention also relates to a level determining apparatus specifically adapted for the above rod, and to a method of using that rod.

The present invention relates to a method for producing a colour space, to a colour target (1) and to the use of such a colour target (1).

A method and apparatus for precisely locating materials includes an elongated survey rod, including a triggering surface, and fastener driver secured to the survey rod.

From the production to the delivery, the focal point is excellence.

A prism (53) positioned in the head portion directs said first line of sight to a second line of sight.

The adhesive layer is maliable in an initial phase such that the relative position of the gun sight to the gun can be adjusted to operationally align the gun sight, and thereafter fixes the gun sight in that alignment.

The invention relates to a geodatic surveying device which is equipped with an automatic target point sighting functionality for determining the position of a target point.

Apparatus and methods for removably mounting an optical sighting device such as a telescopic sight (20) to a firearm (12).

According to still another aspect of the invention, the sight takes a selected action if it detects the presence of a selected color within radiation originating externally of the sight.