6 USEFUL TABLES 



MEASURES OF WEIGHT 



10 milligrams (mg.) ........ = 1 centigram eg. 



10 centigrams = 1 decigram dg. 



10 decigrams 



10 grams 



10 decagrams 



10 hectograms 



gram g. 



decagram Dg. 



hectogram Hg. 



kilogram Kg. or kilo 



ton... ...T. 



1,000 kilograms 



The gram is the weight of 1 cu. cm. of pure distilled water 

 at a temperature of 39.2 F.; the kilogram is the weight of 

 1 liter of water; the ton is the weight of 1 cu. m. of water. 

 CONVERSION TABLES 



By means of the tables on pages 8 and 9, metric measures 

 can be converted into English, and vice versa, by simple addi- 

 tion. All the figures of the values given are not required, 

 four or five digits being all that are commonly used; it is 

 only in very exact calculations that all the digits 

 are necessary. Using table, proceed as follows: 1,828.8 

 Change 6,471.8 ft. into meters. Any number, as 121.92 

 6,471.8, may be regarded as 6,000 + 400 + 70 + 1 21.336 

 + .8; also, 6,000 = 1,000X6; 400 = 100X4; etc. .3048 



Hence, looking in the left-hand column of the .2438 



upper part of the table, page 8, for figure 6 (the 1 972 6046 

 first figure of the given number), we find opposite 

 it in the third column, which is headed Feet to Meters, the 

 number 1.8287838. Now, using but five digits and increas- 

 ing the fifth digit by 1 (since the next is greater than 5), we 

 get 1.8288. In other words, 6 ft. = 1.8288 m. ; hence, 6,000 ft. 

 = 1,000X1.8288 = 1,828.8, simply moving the decimal point 

 three places to the right. Likewise, 400 ft. = 121. 92 m.; 

 70 ft. =21.336 m.; 1 ft. = .3048 m.; and .8 ft. = .2438 m. 

 Adding as shown above, we get 1,972.6046 m. 



Again, convert 19.635 kilos into pounds. The 22.046 

 work should be perfectly clear from the explana- 19.8416 

 tion given above. The result is 43.2875 Ib. 1.3228 



The only difficulty in applying these tables lies .0661 



in locating the decimal point. It may always be .0110 



found thus: If the figure considered lies to the 43 2875 

 left of the decimal point, count each figure in 



