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IMPROVED AND ENLARGED
A PLAIN PRACTICAL SYSTEM
ADAPTED TO THE UNITED STATES.
BY NATHÅN DABOLL,
WITH THE ADDITIOX OF THE
FARMERS' AND MECHANICS:
BEST METHOD OF BOOK-KEEPING, .
COMPANION TO DABOLL'S ARITHMETIC.
BY SAMUEL GREEN.
PRINTED AND SOLD BY GARDINER TRACY,
LATE HASTINGS & TRACY.
By Permission of the Proprietori
DISTRICT OP CONNECTICUT, 88.
the forty-ninth year of the Indep ndence of the United States on America, SAXUBL Gatex, of said District, kath deposited in this office tho title of a Book, the right thereof he claims as Proprietor, in the words' following, to wit :-"Daboll's Schoolmastor's Assistant : Improver and enlarged. Being a plain, practical systen, of Arithmetic: adapted to the United States. By Nathiau Daboll. With the addition of the Practical Accountant, or Farniers' and Mechanics' best matbod of Book-keeping, for the easy instruction of Youth. Dcsigned as a Companion to Daboll's Arithinetic. By Samuel Green."
In conformity to the Act of Congress of the United Staies, entitled." An Act for the encouragement of learning, ly securing the copies of Maps, Charts, and Books, to the Authors and Proprietors of them during the times thercia mentioned."
CHARLES A. INGERSOLL,
Clerk of the District of Connecticut
CHARLES A. INGERSOLL,
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, Professor 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, 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 favourable opinion. According to its original design, I think it well o 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
I Now President of that Institution.
PLAINFIELD ACADEMY, APRIL 20, 1802. I
MAKE use of Dabol.l'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 ANAMS, 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.
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 decided preference to any other system extant, and immediately adopted it for the pupils ander 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 deern it equally well calculated for the benefit of individuais 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.
The design of this work is to furnish the schools of the United States with a methodical and comprehensive system of Practical Arithinetic, 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 scientific 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 thos which are more abstruse and difficult.
To enter into a detail of the whole work would be te. dious; I shall therefore notice only a few particulars, and refer the reader to the contents.
Although the Federal Coin is purely decimal, it is se 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 which will sufficiently apologize for its not being cor change to other