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CORRECTED STEREOTYPE EDITION.

DABOLL'S

SCHOOLMASTER'S ASSISTANT,

IMPROVED AND ENLARGED.

Being a Plain Practical System

ARITHMETICK

ADAPTED TO THE UNITED STATES.

BY NATHAN DABOLL,

Stereotype Boítíon.

WITH THE ADDITION OF THE

FARMERS' AND MECHANICKS' BEST

METHOD OF BOOK-KEEPING,

DESIGNED AS A

COMPANION TO DA BOLL'S ARITHMETICK:

BY SAMUEL GREEN.

ITHACA:
PRINTED AND PUBLISHED BY MAGK AN ANDRUS

By Permission of the Proprietors.

1827.

UNIVERSITY

474130

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District of Connecticut ss.

E IT REMEMBERED, That on the twenty-eight day of September, in the forty-fifth year of the Independence of the United States

of America, Samuel GREEN, of said District, hath deposited in (L. S.) this office the title of a Book, the right whereof he claims as pro

prietor, in the words following, to wit :" Daboll's Schoolmas. te's Assistant : improved and enlarged. Being a plain practical system of Arithmetic : adapted to the United States. Stereotype Edition. By N. (THAN DABOLL."

In conformity to the Act of the Congress of the United States, entitled, An Act for the encouragement of learning, by securing the Copies of Maps, Charts, and Books, to the authors and proprietors of them during the times therein mentioned.

HENRY W. EDWARDS,

Clerk of the District of Connecticut. A true copy of Record: Examined and sealed by me, H. W. EDWARDA,

Clerk of the District of Conth

Yale-College, Nov. 27, 1799. I have read DABOLL'S SCHOOLMASTER'S Assistant. The arrangement of the different branches of Arithmetic is judicious and perspicuous. The author has well explained Decimal Arithmetic, and has applied it in a plain and elegant manner in the solution of various questions, and especially to those relative to the Federal Computation of money. I think it will be a very useful book to Schoolmasters and their pupils.

JOSIAH MEIGS, Pr jussor of

Mathematics and Natural Philosophy. [Now Surveyor-General of the United States.)

I

HAVE given some attention to the work above mentioned, and concur with Mr. Professor Meigs in his opinion of its merit.

NOAH WEBSTER. New-Haven, Dec. 12, 1799.

Rhode Island College, Nov. 30, 1799. I HAVE run through Mr. DABOLL's Schoolmaster's ASSISTANT, and have formed of it a very favourable opinion.

According to its original design, I think it well « calculated to furnish Schools in general with a methodical, easy, and comprehensive System of Practical Arithmetic.” I therefore hope it may find a generous patronage, and have an extensive spread.

ASA MESSER, Professor of the Learned Languages, and teacher of Mathematics.

{Now President of that Institution.]

Plainfield Academy, April 20, 1802. I MAKE use of DABOLL’s SCHOOLMASTER's Assistant, in teaching common Arithmetic, and think it the best calculated for that purpose of any

which has fallen within my observation.

JOHN ADAMS, Rector of

Plainfield Academy. (Now Principal of Philips' Academy, Andover, Mass.]

Billerica Academy, (Mass.) Dec. 10, 1807. HAVING examined Mr. DABOLL’s System of Arith metic, I am pleased with the judgment displayed in his method, and the perspicuity of his explanations, and thinking it as easy and comprehensive a system as any with which I am acquainted, can cheerfully recommend it to the patronage of Instructers.

SAMUEL WHITING,
Teacher of Mathematics.

From Mr. Kennedy, Teacher of Mathematics. I

BECAME acquainted with DABOLL'S SCHOOLMASTER’s Assistant, in the year 1802, and on examining it attentively, gave it my decisive preference to any other system extant, and immediately adopted it for the pupils under my charge ; and since that time have used it exclusively in elementary tuition, to the great advantage and improvement of the student, as well as the ease and assistance of the preceptor. I also deem it equally well cal culated for the benefit of individuals in private instruc tion; and think it my duty to give the labour and ingenuity of the author the tribute of my hearty approval and recommendation.

ROGER KENNEDY. Now-York, March 20, 1811.

PREFACE.

HE design of this work is to furnish the schools of the United States with a methodical and comprehensive syslem of Practical Arithmetic, in which I have endeavoured, through the whole, to have the rules as concise and familiar, as the nature of the subject will permit.

During the long period which I have devoted to the instruction of youth in Arithmetic, I have made use of various systems which have just claims to scientisic merit ; but the authors appear to have been deficient in an important point--the practical teacher's experience. They have been too sparing of examples, especially in the first rudiments ; in consequence of which, the young pupil is hurried through the ground rules too fast for his capacity. This objection I have endeavoured to obviate in the following treatise.

In teaching the first rules, I have found it best to encourage the attention of scholars by a variety of easy and familiar questions, which might serve to strengthen their minds as their studies grow more arduous.

The rules are arranged in such order as to introduce the most simple and necessary parts, previous to those which are more abstruse and difficult.

To enter into a detail of the whole work would be tedious ; I shall therefore notice only a few particulars, and refer the reader to the cont nts.

Although the Federal Coin is purely decimal, it is so nearly allied to whole numbers, and so absolutely necessary to be understood by every one, that I have introduced it immediately after addition of whole numbers, and also shown how to find the value of goods therein, immediately after simple multiplication; which may be of great advantage to many, who perhaps will not have an opportunity of learning fractions.

In the arrangement of fractions, I have taken an entire new method, the advantages and facility of whicn will sufficiently apologize for its not being according to other

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