Note 49 — PART XII. MATHEMATICS.

In Lieut.-Colonel B. Jackson’s scientific “Treatise on Military Surveying, &c., &c., &c.,” Portable trigonometry without logarithms, is thus introduced—

“The following useful application of Trigonometry, by means of the natural sines, tangents, &c., is taken from an early number of that valuable periodical, ‘The Mechanics’ Magazine,’ and will be found particularly suited to the purposes of the military surveyor.”