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theodolite :» The following important experiment has recently been tried at Brighton, in Sussex. On the new or Western Pier a good theodolite was fixed, at an elevation of 30 feet above the water, and directed to a given point on the pier at Worthing, a distance of at least …

Flat earth and telescope: Although the experiments already described, and many similar ones, have been tried and often repeated, first in 1838, afterwards in 1844, in 1849, in 1856, and in 1862, the author was induced in 1870 to visit the scene of his former labours, and to make some …

Along the edge of the water, in the same canal, six flags were placed, one statute mile from each other, and so arranged that the top of each flag was 5 feet above the surface. Close to the last flag in the series a longer staff was fixed, bearing a …