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Harmonia trigonometrica; or, a short treatise of trigonometry: wherein the harmony between plane and spherical trigonometry is clearly exhibited, and thereby all the Difficulties and Perplexities of the latter are entirely removed; so that both are render'd equally easy, their similar Cases being solved by Theorems materially, and almost verbally the same.
- Owen, Henry, 1716-1795.
- M.DCC.XLVIII. 
About this work
London : printed for Edward Cave, at St John's Gate, M.DCC.XLVIII. 
29[i.e.31],p.,plate ; 40.
Electronic reproduction. Farmington Hills, Mich. : Thomson Gale, 2003. (Eighteenth century collections online). Available via the World Wide Web. Access limited by licensing agreements.