Abstract
Abstract Two methods for the determination of heights have been compared on a 50 m test line: Conventional optical precise levelling with a Ni 007 Carl Zeiss lena level. Direct vertical alignment with a He–Ne laser and photo-electric target. Fifteen vertical alignments of point 5 (Fig. 1) on the line 1–4 were performed. The height of point 5 was determined from precise levelling before laser measurement for the comparison of results (Table 4). The laser alignment was performed with prototypes of instruments (Figs. 4–6) designed and constructed by author at Academy of Technology and Agriculture in Bydgoszcz.
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