PLAINFIELD ACADEMY, APRIL 20, 180%.. 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, 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 pupiís under my charge ; and since that time have used it exclusively, in elementary tuition, to the great adrantage and improvement of the student, as well as tive ease and as. sistance 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. d V The design of this work is to furnish the schools of During the long period which I have devoted to the 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 ininds as their studies grow.more arduous. The rules are arranged in such order as to introduce the most siinple and necessary parts, previous to those which are more abstruse and difficult. Toenter 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 so In the arrangement of fractions, I have taken an entire systems. As decimal fractions may be learned much easier than vulgar, and are more simple, useful, and neces. sary, and soonest wanted in more useful branches of Arithmetic, they ought to be learned first, and Vulgar Fractions omitted, until further progress in the science shall make them necessary. It may be well to obtain a general idea of them, and to attend to two or three easy problems therein : after which, the scholar may learn decimals, which will be necessary in the reduction of currencies, computing interst, and inany other branches. Besides, to obtain a thorough knowledge of Vulgar Fractions, is generally a tasi too hard for young scholars who have made no further progress in Arithmetic than Reduction, and often discourages them. I have therefore placed a few problems in Fractions, according to the method above hinted ; and after roing through the principal mercantile rúles, have treated upoč Vulgar Fractions at large, the scholar being now capable of going through them with advantage and ease. In Simple Interest, in Federal Money, I have given several new and concise rules ; some of which are particularly designed for the use of the compting-house. The Appendix contains a variety of rules for casting Interest, Rebate, &c. together with a number of the most easy and useful problems, for measuring superficies and solids, examples of forms commonly used in transacting business, useful tables, &c. which are designed as aids in the common business of life. Perfect accuracy, in a work of this nature, can hardly be expected; errors of the press, or perhaps of the au, thor, may have escaped correction. If any such are point: ed out, it will be considered as a mark of friendship and fayor, by The public's most humble NATHAN DABOLL. Page. ADDITION, Simple Annuities or Pensions, at Compound Interest Coins of the United States, Weights of Evolution, or Extraction of Roots Inverse Proportion Suppliment to Compound 15 109 Page. of Currencies, do. of Coin 89, 98 100, 108 Rules, for reducing the different currencies of the several United States, also Canada and No. va-Scotia, each to the par of all others 96, 97 Short Practical, for calculating Interest 126 for casting Interest at 6 per cent. . for finding the contents of Superfices & Solids 220 to reduce the currencies of the different Rebate, A short method of finding the, of any giv- 217 Adition, Subtraction, and Multiplication 10 showing the number of days from any day of one month, to the same day in any other showing the amount of 11. or 1 dollar, at 5 & 6 per cent. Compound Interest, for 20 years 232 shewing the amount of ll. annuity, forborne for:31 years or under, at 5 and 6 per cent. showing the present worth of 11. annuity, for 31 yrs. at 5 & 6 per c. Compound Interest ib of cents, answering to the currencies of the United States, with Sterling, &c. showing the value of Federal Money in Tare and Trett 114 Useful Forms in transacting business Weights of several pieces of English, Portuguse, & French, gold coins, in dollars, cents, & milks 234 |