XIV LE TABLEAU STÉRÉOMÉTRIQUE

No. 13567. Subj. 995. Ref. 20814, Department of Publie Works.

OTTAWA, Feby. 7th 1872, Sir,—1T am directed by the Minister to request you to furnish the Department with one of your ‘“ Tableau Stéréométrique.” Chs. Baillairgé, Esq., F, BRAUN, Architect, etc., Quebec. Secretary.

New HAvex, Feb. 7th 1872.

Cus. BAILLAIRGÉ, Esa. .

Dear $Sir,—I have been much interested in looking over the papers descriptive of your useful, valuable and (as it very plainly appears) universal application of a rule for the mensuration of solids. I sincerely congratulate you on the success which your discovery has met with in all quarters in which it has at present been introduced. It must have been a great labour to work it out to its present state of perfection and you have the satisfaction of knowing that you are a benefactor and staunch pilot in that sea of difficulty, Geometry.

Yours very sincerely, E. B. BARBER.

HiGx SCHOOL, QUEBEC, 8th Feb. 1872.

The rule is precise and simple, and being applicable to almost any variety of solid, will greatly shorteu the processes of calculation.

I'have proved its accuracy as applied to several bodies. The Tableau comprising a great variety of elementary models will serve admirably to educate the eye and must great!y facilitate the study of solid mensuration. The Government would confer a boon on shoobls of the middle and higher class by affording access to so suggestive a collection. D. WiLkie, Rector,

Extrait d'un Editorial de la “ Quebec Gazette” du 22 Mai 1872, sur la lecture de Mr. Baillairgé devant la société Littéraire et Historique de Québec.

The lecturer exhibited his Stereometrieal Tableau, which is now attracting so much attention in this as well as other countries, and demonstrated, to the perfect satisfaction of his hearers, that it wi fully entitled to all the advantages claimed for it. At the close . the reading, Capt. Ashe, R. N., in proposing a vote of thanks to the lecturer, whilst claiming for Dr. Simpson the discovery of the prismoidal formula, as known to apply to certain bodies (a fact alluded to in the lecture), nevertheless highly complimented Mr. Baillairgé, for his general application of the formula to all known solids.