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RECOMMENDATIONS.

Having duly examined the inclosed work, in manuscripts i am constrained and deem it proper, to recommend it to the patronage of a generous publick, as being a valuable and useful production ; valuable from its tendency, to bring into general'ase, that which has, hitherto, been known to but lew ; useful, in vastly abridging the labour of Arithmetical and Mathematical calculations, that the surveyor and artist have frequently to make, also in containing some things, never before known to have been published.

CYRUS CARPENTER,

Physician, and Mathematician. Whiting, Vt. May 24, 1824.

Having been thoroughly convinced by daily experience ibat a work like the present was much needed as well by the mechanick as by the inathematician and the surveyor, it was with no inconsiderable degree of interest that I gave it a perusal. After having attentively and minutely examined it, I find that the author has correctly anticipated the defects of works of this description in use, and has admirably supplied them. He has not only very much abridged the labour of many mathematical estimations; and simplified many processes which were formerly tedious and perplexing; but has embodied in his work many interesting facts which are original ; or at least not to be found in similar productions. Upon the whole, I consider the work well calculated to promote the interests of mathematical scieace, and sincerely hope it will meet with that liberal reception from an intelligent publick, which its merits deserve. SAMUEL BEACH, County Surveyor.

Addison County, VL.

We, the subscribers, have perused with some degree of pleasure, a Treatise on Gunter's Scale, &c. prepared Idr the press, by George Curtis, and have minutely exam

ined that part which relates to the measurment of timber and boards by the Sliding Rule, and do cheerfully recommend it as being an easy and concise way of getting the contents of solid bodies of every description; and the ready calculated tables of round and square timber which never bave appeared in any work of this kind, cannot fall to render it valuable to all those who deal in lumber.

ISAAC COLLINGS,

Inspector of Lumber,

ASA EDDY. Whitehall, August 24, 1824.

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