Minutes of proceedings of the Royal Artillery Institution (1858)
Great Britain. Army. Royal Artillery Institution · Woolwich, Eng., : The Institution · leaf 737
5 SHORT NOTES ON PROFESSIONAL SUBJECTS. 9. Small telemeter for military purposes.* This instrument consists of a strong tube about 2 feet in length ; at each end there is a small mirror placed at an angle of 45° to the axis of the tube, and in the centre two other mirrors crossing each other at… … Note. — There is an opening in the centre of the instrument for direct vision, and for the purpose of illuminating the micrometer wires when using the instrument at night. All openings can be closed with shutters when required. A prismatic compass is fixed on the top of the tube, so that the…
Artillery -- Periodicals · Artillery -- Great Britain -- Periodicals
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
