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Still there would be much labor of computation which may be saved by the use of tables of external secants and versed sines, which have been employed with great success recently by the Eugineers on the Ohio and Mississippi Railroad, and which, with the formulas and rules necessary for their application to the laying down of curves, drawn up by Mr. HASLETT, one of the Engineers of that Road, are now for the first time given to the public. This portion of the volume alone, by the great abridgment of labor for which it pro. vides the means, and the simplicity and convenience of the mattewhich it furnishes, will give it an extensive circulation among Practical Engineers
But besides this, the Architect, the Shipbuilder, the Mason, the Carpenter, the Joiner, the Manufacturer and Artisan in iron and every species of material, will find rules and recipes for all kinds of estimates, computations, constructions, compositions, mixtures, et cetera, which will excite surprise at their number, novelty, and value to every one.
The contents of this volume are of so varied a nature that it was not deemed necessary to make any strenuous efforts to arrange them systematically. Being solely intended for a book of reference, the relative order of the subjects is immaterial; and the copious Table of Contents and Index afford all the assistance that can be desired by those who wish to consult its pages.
, sines) nish, is ated in aans of etime reased thmic
28. To biseot any given triangle, .
To describe a circle of greatest dian 1:
8. To find tbe area of a triangle,
12. To find the convex surface and sclid content of a cylindric ring,
To find the units of work in raising a given weight a given height,
of the pressure of steam, in inches of mercury, it different tempera
with which it is in contact, .
quantity of water evaporated by given weights, &c.,