The Portable Transit Instrument in the Vertical of the Pole Star: Translated From the Original Memoir of Wm; D�llen (Classic Reprint) - Hardcover

Name: The Portable Transit Instrument in the Vertical of the Pole Star: Translated From the Original Memoir of Wm; D�llen (Classic Reprint)
Author: Cleveland Abbe
ISBN: 9780265252390

Cleveland Abbe

9780265252390: The Portable Transit Instrument in the Vertical of the Pole Star: Translated From the Original Memoir of Wm; D�llen (Classic Reprint)

Hardcover

ISBN 10: 0265252393 ISBN 13: 9780265252390

Publisher: Forgotten Books, 2018

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Master timekeeping with a portable transit instrument, using Polaris as your guide.

This historical translation explains a practical method for determining time from observations made with a transit mounted in the vertical of the Pole Star. The work outlines how this instrument can yield precise results under varying field conditions, with attention to install accuracy and observational technique.

The volume presents the Ertel portable transit instrument in depth, comparing it with earlier designs and detailing how to observe near the pole for reliable timing. It covers mounting, orientation, and the two-position observations needed to reduce errors, along with the care required to keep the instrument stable during the measurements. The methods are tied to real-world field use and supported by computation and example tables.

How to align the instrument using Polaris and manage observations in two positions to control drift.
Techniques to check instrument stability and minimize collimation and azimuth errors.
Practical discussion of reading the horizontal circle and micrometer scales for accurate results.
Examples and tables showing the calculation steps and reductions used in the process.

Ideal for readers of historical astronomy, surveying, and the development of portable timekeeping tools.

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