ATSRONOMY Troughton's Universal Equatorial Instrument - 1816 Print A. REES

Legend to the illustrations in the print: Equatorial instrument at Arnaugh, made by Troughton An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope. Called also an equatorial telescope. &hand; The term equatorial, or equatorial instrument, is sometimes applied to any astronomical instrument which has its principal axis of rotation parallel to the axis of the earth. Print Specifics: Type of print: Copperplate engraving - Original antique print Year of printing: 1816Author: Abraham Rees, D.D F.R.S F.L.S. Publisher: Arts Directs - Longman, Hurst, Rees, Brown, and Orme, Paternoster Row, London. Condition: 2 (1. Excellent - 2. Very good - 3. Good - 4. Fair). Age toning of paper, mostly along the edges. Please examine the photo for extent. Overall dimensions: 8 x 10 1/2 inches, (20 x 26.5 cm).Paper weight: 2-3 (1. Thick - 2. Heavier - 3. Medium heavy - 4. Slightly heavier - 5. Thin)Reverse side: Blank Note: (1) Green color around the print in the photo is a contrasting background on which the print was photographed. (2) The detail of the print is much sharper than the photo of the print. Martin2001 Satisfaction Guaranteed Policy! Any print purchased from me may be returned for any (or no) reason for a full refund including all postage. Internet seller since 1998.Five-star service.