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DABOLL'S

SCHOOLMASTER'S ASSISTANT :

IMPROVED AND ENLARGED.

BEING A PLAIN

PRACTICAL SYSTEM

OF

ARITHMETIC ;

ADAPTED TO THE UNITED STATES.

STEREOTYPE EDITION.

BY NATIIAN DABOLL.

NEW-LONDON:

PRINTED AND PUBLISHED BY SAMUEL GREEN, PROPRIETOR

OF THE COPYRIGHT.

1815.

.......
J. F. & C. Starr, Stereotype Founders... Hartford,

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DISTRICT OF CONNECTICUT, 89.

BE IT REMEMBERED, That on the twenty

first day of October, in the thirty-sixth year of the Independence of the United States of America, SAMUEL Gruen, of said District, hath deposited in this office the tide of a Book, the right whereof he claims as Proprie. tor, in the words foliowing, to wit:- Daboll's Schoolmaster's Assistant : improved and enlarged. "Being a plain practical system of Arithmetic: adapted to the United States. Stereotype Edition. By Nathan DA-,

In conformity to the Act of the Congress of the United Sates, entitled, “ An Act for the encouragement of learnide, by securing the copies of Maps, Charts and Books, to the Authors and proprietors of them during the times tikrein mentioned."

HIENRY W. EDWARDS,

Clerk of the District of Connecticut. A truc copy of Record: Examined and sealed by me,

H. W. EDWARDS, Clerk of the Dist. of Cunn.

DOLL."

6-12-45 52944

PLAINFIELD ACADEMY, APRIL 20, 1802. I MAKE use of DABOLI'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 Phillips' Academy, Andover, Mass.

BILLERICA ACADEMY, (MASS.) DEC. 10, 1807. . HAVING examined Mr. DABOLL'S System of Arithmetic, 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 Instructors.

SAMUEL WHITING,
Teacher of Mathematics.

FROM MR. KENNEDY, TEACHER OF MATHEMATICS.

I BECAME acquainted with DABOLI's SchoolMASTER'S ASSISTANT, in the year 1802, and on examining it attentively, gave it my decided 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 case and assistance of the Preceptor. I also deem it equally well calculated for the benefit of individuals in private instruction; and think it my duty to give the labour and ingenuity of the author the tribute of my hearty approval and recommendation.

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

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YALE-COLLEGE, Nov. 27, 1799. I HAVE read DABOLL'S SCHOOLMASTER'S ASSISTÁNT. T'he arrangement of the different branches of Arithmetic is judicious and perspicuous. The author has well ex. plained 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, Professor of

Mathematics and Natural Philosophy. [Since Surveyor-General of the United States.]

I HAVE given some attention to the work above mentioned, and concur with Mr. Professor Meigs in his opin. ion of its pierit.

NOAH WEBSTER, New-Haven, December 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 favorable 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 Arith metic." 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.

(President of that Institution.]

THE design of this work is to furnish the schools of the United States with a methodical and comprehensive system of Practical Ariilmetic, in which I have endeaYoured, through the whole, to liave the rules as concise and familiar, as the nature of the subject will permit.

During the long period which I lave devoted to the instruction of youth in Arithmetic, I have made use of various systems which have just clains to scientific mert; but the authors appear to ba e been deficient in an npertant point--the practical teacher's experience.---i'hey have been too sparing of examples, especially in Che first rudiments; in consequence of which, the young

upil is hurried through tle ground rules too fast for his 1 apacity. 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 introluce the most simple and necessary parts, previous to those which are more abstruse and dificult.

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 contents.

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 numsers, and also shown how to find the value of goods therein, immediately after sim le multiplication; which may be of great advantage tò many, who perhaps will not haie an opportunity of learning fractions.

In the arrangement of fractions, I have taken an entire new method, the advantages and facility of which will i ufficiently apologize for its not being according to utier

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