Abstract
An improved laser alignment aid has been designed and built for use in engineering operations such as tunnel boring, pipe laying, or road construction to provide a permanent straight line which maintains its true position between periodic checks by a surveyor, thus avoiding expensive errors.
A laser tube has been used which has sealed mirror construction, and the mechanical design is such as to give improved stability in the field. This makes for a second generation instrument which should allow more widespread practical experience of lasers to be obtained in the open.
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