Experience suggests that the seemingly explicit term ‘alignment’ is capable of varying interpretations depending upon the discipline in which one is working. For example, the surveyor might regard alignment of a road as setting out markers to define the path that it is intended to follow; this may be neither straight nor level. The engineer constructing very large electricity generating plant is much concerned with the relative alignment of the individual units of which it is comprised. Normally this is a straight line in plan, but in elevation it may more nearly resemble a catenary.
KeywordsNational Physical Laboratory Zone Plate Beam Expander Alignment Technique Fresnel Zone Plate
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