APOTHECARIES WEIGHT. By this weight, apothecaries compound their medicines, but buy and sometimes sell by Avoirdupoise weight. The pound and ounce are the same as in Troy Weight, but differently divided and subdivided Is used to measure distances of places, and every thing where length only is considered, likewise to take the dimensions of the length, breadth, and thickness of all bodies. 12 Lines (Ln.).... make .... One Inch.. 12 Inches... 8 Furlongs. 3 Miles.. 69 English Miles) 547 Irish Miles.. J 360 Degrees.. One Foot, ... ft. yd One League.. M. Deg. One deg. of a great circle of the earth. A great circle of the Earth. Or in measuring distances of places as follows : Roads are sometimes measured by an instrument called a perambulator, or surveying wheel. The English perch being but 5 yards long, and the Irish perch 7, it is evident, that the furlong and mile must be in the same proportion, that is, 11 Irish are equal to 14 English miles, for 11x7=77 and 14×51=77. Is used in ascertaining the contents of surfaces, wherr both the length and breadth are measured. In Ireland, plantation or Irish Measure is most generally used, but in some places, especially in the neighbourhood of large cities or towns, where land is of greater value than where not contigious thereto, Statute or English measure is common; I have, therefore, given the divisions of both, in this, and in the preceding article. An Irish plantation perch contains 49, and an English statute perch but 30 square yards, each of which, being multiplied by 4, to take away the fraction, gives 196 for the former, and 121 for the latter, which is, therefore the proportion of Irish to English perches or acres, 121 Irish being equal to 196 English. A square inch foot, perch, &c. is one inch, foot, perch, &c. long, and the same broad. 12x12 144 Square Inches.....make.. One Square Foot. 3x 3 5X5 ........... 9 Square Inches...... 30 Square Yards... 7X7 49 Square Yards...... 40 Square Perches 4 Roods... 7.83 Inches....... 10,8 Inches. ..... 25X25 625 Square Links. ... One Square Yard. One Acre. One Link English. The dimensions of Land are commonly taken by a chain, containing 4 perches or 100 links, as before mentioned, or more commonly by one, containing only 2 perches, or 50 links. |