Title: A treatise on mathematical instruments : including most of the instruments employed in drawing, for assisting the vision, in surveying and levelling, in practical astronomy, and for measuring the angles of crystals : in which their construction, and the methods of testing, adjusting, and using them, are concisley explained /
Authors: Heather, J. F. -1886.
Publisher: J. Weale,
Year: 1856
Subjects: Angles (Geometry) Measurement; Mathematical instruments; Optical instruments; Surveying Instruments; Astronomical instruments