This zenith telescope (left ) was one of four such instruments made by... | Download Scientific Diagram
![Elements of theoretical and descriptive astronomy, for the use of colleges and academies. Method, amethod very commonly used by the United States Coast Survey.The instrument employed is the zenith telescope, a Elements of theoretical and descriptive astronomy, for the use of colleges and academies. Method, amethod very commonly used by the United States Coast Survey.The instrument employed is the zenith telescope, a](https://c8.alamy.com/comp/2AG6AJD/elements-of-theoretical-and-descriptive-astronomy-for-the-use-of-colleges-and-academies-method-amethod-very-commonly-used-by-the-united-states-coast-surveythe-instrument-employed-is-the-zenith-telescope-a-modificationof-the-altitude-and-azimuth-instrument-the-two-stars-are-soselected-that-the-difference-of-their-zenith-distances-is-less-thanthe-breadth-of-the-field-of-the-telescope-the-instrument-is-setin-the-plane-of-the-meridian-to-the-mean-of-the-two-zenith-dis-tances-and-for-the-star-which-culminates-first-when-this-starcrosses-the-meridian-it-is-bisected-by-the-micrometer-wire-2AG6AJD.jpg)
Elements of theoretical and descriptive astronomy, for the use of colleges and academies. Method, amethod very commonly used by the United States Coast Survey.The instrument employed is the zenith telescope, a
![Astronomy for students and general readers . he instrument which carries the tele-scope at one end, and a counterpoise at the other. The whole in-strument can revolve 180° in azimuth about Astronomy for students and general readers . he instrument which carries the tele-scope at one end, and a counterpoise at the other. The whole in-strument can revolve 180° in azimuth about](https://c8.alamy.com/comp/2CDEYHK/astronomy-for-students-and-general-readers-he-instrument-which-carries-the-tele-scope-at-one-end-and-a-counterpoise-at-the-other-the-whole-in-strument-can-revolve-180-in-azimuth-about-this-pillar-the-tele-scope-has-a-micrometer-at-its-eye-end-and-it-also-carries-a-dividedcircle-provided-with-a-fine-level-a-second-level-is-providedwhose-use-is-to-make-the-rotation-axis-horizontal-the-peculiarfeatures-of-the-zenith-telescope-are-the-divided-circle-and-its-at-tached-level-the-level-is-as-shown-in-the-cut-in-the-plane-ofmotion-of-the-telescope-usually-the-plane-of-the-meridian-an-2CDEYHK.jpg)
Astronomy for students and general readers . he instrument which carries the tele-scope at one end, and a counterpoise at the other. The whole in-strument can revolve 180° in azimuth about
![Wanschaff Zenith Telescope Photograph by Royal Astronomical Society/science Photo Library | Fine Art America Wanschaff Zenith Telescope Photograph by Royal Astronomical Society/science Photo Library | Fine Art America](https://images.fineartamerica.com/images-medium-large-5/wanschaff-zenith-telescope-royal-astronomical-societyscience-photo-library.jpg)