Principi e applicazioni di chimica dei pozzi; . misurare un metro di misura in ogni direzione. Questo, riempito con acqua distillata alla sua maggiore densità (ad una temperatura di termometro di 39° Fahrenheits), è stato preso come sostantivo dei pesi decimali, e chiamato una quantità di grammo^âa uguale a aboutquindici grani inglesi. Il grammo, multiplato e diviso per dieci, dà allgli altri pesi più grandi o più piccoli. Thusâ Pesi Più Piccoli. Pesi Più Grandi. Grammo. Grammo. Decigramma = 1-10esimo grammo. Decagram Centigram= 1-lOOth gram. I^Iilligram=l-l,OOOth gram. 10 grammi. Hectogramme= 100 grammi
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Wells's principles and applications of chemistry; . measuring one centi-metre in every direction. This, filled with distilled water at its greatestdensity (at a temperature of 39° Fahrenheits thermometer), was taken as thounit of the decimal weights, and called a gramme^âa quantity equal to aboutfifteen English grains. The gramme, multiphed and divided by ten, gives allthe other larger or smaller weights. Thusâ Smaller Weights. Larger Weights. Gramme. Gramme. Decigramme = 1-lOth gramme. Decagramme Centigramme= 1-lOOth gramme. i^Iilligramme=l-l, OOOth gramme. 10 grammes.Hectogramme= 100 grammes.Kilogramme = 1, 000 grammes.MyriagTamme==l 0, 000 grammes. The kilogramme corresponds in its use in all commercial transactions withthe English pound. Its weight is equal to about 2|- pounds avoirdupois. Pronounced Gram. QiTKBTio^re.âWhat is the Metre of the French system? How are the larger andBmallcr measures of length derived from the Metro ? ITow is the system of â¢weights de-rived from the measures of Icngtli ? What is a Kilogrammo ? o. 26 PRINCIPLES OF CHEMISTRY. 36. Construction of fig. i.the Balance.âThe bal-ance used for all deli-cate chemical experi-ments is constructed inthe most perfect man-ner. The point of sup-port of the beam (see Fig. 7) is a wedge of hardenedsteel with a sharp, knife-like edge, which rests upon a flatplate of polished agate. The points of support of the twoscale-pans are often constructed in a similar manner. In all nice experiments the balance must be screened from currents of air, and the bodies weighed must have nearly the same temperature as that of thesurrounding atmosphereâotherwise currents of air, ascending and descending, will be produced, which will impair the accuracy of the weight. Balances are at the present time constructed for chemical operations, sodeUcate and exact, that they are able to indicate the weight of a thousandthpart of a grain. For the experiments described in this book, a common apothecaries balanceis all that
