. Annual report. Agricultural education. 1895.] PUBLIC DOCUMENT —No. 31, 133 ECKHOLD'S OMNIMETEK BY PROP. A. COTJRTENAY WASHBURNE. This important surveying instrument, one form of which is shown in Fig. 1, measures distances and altitudes with an extraor- dinary degree of accuracy and great economy of time and labor; it accomplishes the work of theodolite, level and chain, and is a perfect transit theodolite. This instrument (Fig. 1) has a powerful microscope ab, per- manently fixed at right angles to a telescope cd. This microscope ab is now con- structed with a long diagonal eye- piece fitte
. Annual report. Agricultural education. 1895.] PUBLIC DOCUMENT —No. 31, 133 ECKHOLD'S OMNIMETEK BY PROP. A. COTJRTENAY WASHBURNE. This important surveying instrument, one form of which is shown in Fig. 1, measures distances and altitudes with an extraor- dinary degree of accuracy and great economy of time and labor; it accomplishes the work of theodolite, level and chain, and is a perfect transit theodolite. This instrument (Fig. 1) has a powerful microscope ab, per- manently fixed at right angles to a telescope cd. This microscope ab is now con- structed with a long diagonal eye- piece fitted paral- lel to the telescope cd, thus bringing the eye-pieces of the microscope and telescope close to each other, and rendering the op- eration of read- ing the scale AB easier. Both tel- escope and micro- scope move on the same axis 0, hence the axis of cd is always perpendic- ular to the axis of ab. The microscope is directed to the divisions of a finely divided scale AB which is fixed to the horizontal plate g. This scale is four inches in length, divided into 64 numbered equal parts ; each of these 64 parts is halved by an unnumbered line; thus the four-inch scale AB is divided into 128 equal Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural College; Massachusetts Agricultural Experiment Station; Massachusetts Agricultural Experiment Station. Annual report of the Hatch Experiment Station of the Massachusetts Agricultural College. Boston : [s. n. ]
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherbostonsn, bookyear1
