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., by J. F. Heather

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.
Author:	Heather, J. F. (John Fry), -1886
Note:	J. Weale, 1856

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Subject:	Angles (Geometry) -- Measurement
Subject:	Astronomical instruments
Subject:	Mathematical instruments
Subject:	Optical instruments
Subject:	Surveying -- Instruments
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