CHAPTER XXVII 



Computation Tables 



Most of the tables and estimates that the farmer needs in his "figur- 

 ing " will be found in this chapter ; but greenhouse computations will 

 be found in Chapter XI, silos and other construction in Chapter XXV, 

 and board measure and log measure in Chapter XII. 



Tabhs of Regular American Weights and Measures 



Avoirdupois or commercial weight 



27Ji grains =1 dram. 



16 drams =1 ounce. 



16 ounces =1 pound. 



25 pounds =1 quarter. 



4 quarters, or 100 pounds =1 hundredweight. 



20 hundredweight, or 2000 lb =1 ton. 



480 pounds =1 imperial quarter. 



100 pounds is also called 1 cental. 



2240 pounds =1 long ton. 



t. cwt. lb. oz. dr. gr. 



1 = 20 = 2000 = 32,000 = 512,000 

 1 = 100 = 1.600 = 25,600 



1 = 16 = 256 = 7000 



1 = 16 = 4375 



Troy or jewelers' weight 



24 grains =1 pennyweight. 



20 pennyweights =1 ounce. 



12 ounces =1 pound. 



lb. oz. pwt. gr. 

 1 = 12 = 240 = 5760 

 1 = 20 = 480 

 1 = 24 



Apothecaries' weight 



20 grains =1 scruple. 



3 scruples =1 dram. 



8 drams =1 ounce. 



12 oiinces =1 pound. 



lb. oz. dr. 8cr. gr. 



1 =- 12 = 96 = 288 = 5760 



1 = 8 = 24 = 480 



1 = 3 = 60 



1 = 20 



516 



