ADAPTOR FOR A LINE OF SIGHT MEASUREMENT INSTRUMENT

摘要

An adaptor (22) is described for use with a line of sight measurement instrument (10) having a lens (14) and lens hood (16). The instrument (10) typically emits a laser beam through the centre of lens (14). The adaptor (22) includes a body (24) provided with an opening (26) dimensioned to fit over the lens hood (16), and a laser module (28) supported by the body (24) for emitting a line laser beam. The body (24) is supported and can be rotated about the lens hood (16) to vary the rotational position from which the laser beam from laser module (28) is emitted relative to the lens (14). In one embodiment, the opening (26) extends through the whole length of the body (24) so as to open onto opposite faces (31 and 35). The module (28) is disposed so that the line beam emitted therefrom is intersected by the laser beam emitted from the instrument (10).