.... ... Ditto, with lengthening bar to large compass, ivory bow pencil, ivory sector, ivory parallel rule, and Ditto, with double additional joint to compass, bow pen £ s. d. 0 18 0 1 4 6 1 66 1 10 0 1 16 0 2 2 0 Ditto, in German silver ditto, in rosewood case 2 8 0 Ditto, with set of spring bows and extra pen, in rosewood case, lined with silk velvet, ivory sector, ivory parallel rule, and ivory protractor, German silver mounted .... Ditto, with three extra hand pens, highly finished, rules .... Ditto, with tubular compasses Ditto, with extra wheel to compass Ditto, fitted complete for architects, surveyors, civil engineers, &c....... Cronmires' complete case of instruments, with all the above improvements, expressly adapted for civil engineers, architects, and military officers........ Ditto, exquisitely finished From £1 8s. to £4 4s. each. From £3 10s. to £10 10s. each. ....from 009 Rolling Parallel Rules. 6-inch to 24-inch, ivory edges, divided..........from T Squares or Drawing Squares. 12-inch to 36-inch ....from 0 0 1 Drawing and set squares with straight edge, the set of four, as supplied to the Government Department of Practical Art. ... Ditto, Cronmires' much improved brass compass, for black board use, as supplied to the Government Department of Practical Art Universal Compasses, Containing a complete Set of Instruments, 3s. each. 03 9 0 2 6 Drawing Pins, from 2s. per gross. W. H. MYERS, PRINTER, 202, WHITECHAPEL ROAD. FOR SCHOOLS AND FAMILIES. Second Edition, price 4s. 6d., THE SCIENCE OF ARITHMETIC: A SYSTEMATIC COURSE OF NUMERICAL REASONING AND COMPUTATION, WITH VERY NUMEROUS EXERCISES. BY JAMES CORNWELL, PH. D., AND JOSHUA G. FITCH, M.A. SPECIMEN PAGE OF THE SCIENCE OF ARITHMETIC. 19 14. The value of each separate figure used in our Arithmetic is shown by its POSITION only. For example, that which in our spoken language is called ten, is written as the figure 1, with one other figure to its right. In like manner that which is expressed by the word hundred, is represented in writing by the figure 1, with two others to its right. By this plan it becomes unnecessary to put any mark on a 3 or a 5 to show that it should mean 3 tens or 5 tens of tens, the meaning being shown by the position each figure occupies in a row. 15. The units of the several degrees (11) have their value represented by the place in which they stand, beginning at the right hand, as follows: A number meaning units only, is a unit of the first place. tens ten-thousands hundred-thousands Thus in the line of digits-6666666, second third which we read, six millions, six hundred and sixty-six thousands, six hundred and sixty-six, every 6 has a different value: the first on the right hand means simply 6; the second has one figure on its right, and means 6 tens; the third has two figures after it, and means 6 hundreds; the fourth, having three to its right, means 6 thousands; the fifth, 6 tens of thousands; the sixth, 6 hundreds of thousands; and the last, which has six figures to its right, means 6 millions. Each of the figures will be seen to mean ten times more than that on its right. mean EXERCISE II. In the following collections underline all the figures which (a). Tens. 575; 64; 8297; 48623; 59; 161; 3287; 15. (b). Hundreds. 287; 35698; 4523; 889621; 3391; 178; 39625; 84721. (c). Thousands. 2896; 5832145; 627489; 82713; 9862; 59418; 327145; 56732. (d). Millions. 827463857; 94728547; 832749683; 7283471. |