A short manual of analytical chemistry, qualitative and quantitative,--inorganic and organic . Fig. i8. placing rider weights upon the graduated beam, aided by weights made eitheraccording to the metrical or the English system, as follows:— (a) The Metrical system.—The metrical weights of precision above onegramme are in brass; and then we have -5, -2, -i, -j, and following them?05, -02, -01, -01, all in platinum or aluminium quantities below -oi (one centigramme) are weighedby a rider on the beam. The combination of 5, 2, i,^j^g. and I has been chosen because they have been foundI I
A short manual of analytical chemistry, qualitative and quantitative,--inorganic and organic . Fig. i8. placing rider weights upon the graduated beam, aided by weights made eitheraccording to the metrical or the English system, as follows:— (a) The Metrical system.—The metrical weights of precision above onegramme are in brass; and then we have -5, -2, -i, -j, and following them?05, -02, -01, -01, all in platinum or aluminium quantities below -oi (one centigramme) are weighedby a rider on the beam. The combination of 5, 2, i,^j^g. and I has been chosen because they have been foundI I to give the greatest number of possible combinationswith the fewest weights. Figure 19 shows such a boxof metrical weights as usually employed in quantitativeanalysis. The metrical system is founded upon the mitre. The metre ismultiplied and divided entirely by 10, thus :—. Fig;. 19. WEIGHING AND MEASURING. 99 Kilo-metre . .Metre .Deci-metre .Centi-metre .Milli-metre . 1000 100 10 1-?I •01?001 The metre taking the practical place of the English yard, the decimetreconsequently takes the place of the foot, and the centimetre of the inch ; andjust as weight is got in our system from the cubic inch, so it is got metricallyfrom the cubic centimetre, only much more simply, because i cubic centimetreof distilled water, measured at 4° C. and 760 millimetres bar., weighs onegramme. The gramme is multiplied and divided exactly as the metre, thus :— Kilo-gramme looo Hecto-gramme . ... lOO Deca-gramme lo Gramme 1 Deci-gramme ..... I Centi-gramme ..... Oi Milli-gramme 001 One kilogramme (1000 grammes) of water at the standard temperature andpressure measures one litre (or 1000 cubic centimetres), and we have thereforethe following simple relation of weights and measures of water :— Weight. Measure. 1000 grammes .... I litre or looo cu
Size: 2037px × 1227px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectchemistryanalytic
