Der Hammer-Fennel'sche Tachymeter-Theodolit und die Tachymeter-kippregel zur unmittelbaren Lattenablesung von Horizontaldistanz und Höhenunterschied

Abstract

PROF. HAMMER has long occupied himself with the problem of constructing an instrument which should give the surveyor the necessary data for plotting his work with the least possible difficulty. Indeed, his numerous references to his previous work, and to the criticisms he has from time to time offered on the work of others, make his introduction not a little difficult to read. But, since the history of his work connected with tacheometers is set out with true German completeness, it may be valuable to anyone who is working on similar lines. In 1893 the author began to solve the following problem: to devise a tacheometer-theodolite, by which at one operation and without reading an altitude circle the observer could determine both the horizontal distance and the difference of altitude of a selected spot from the instrument. This problem the author now claims to have satisfactorily solved, and the instrument is on the market; but notwithstanding this long preparation we gather that several small improvements touching the arrangement of the microscopes and the general mounting of the instrument are still contemplated.

Der Hammer-Fennel'sche Tachymeter-Theodolit und die Tachymeter-kippregel zur unmittelbaren Lattenablesung von Horizontaldistanz und Höhenunterschied.

Von Dr. E. Hammer, Professor an der K. Technischen Hochschule in Stuttgart. Mit 16 Figuren im Text und 2 Lithographierten Tafeln. Pp. 52. (Stuttgart: Konrad Wittwer, 1901.)