808 



THE STANDARD DICTIONARY OF FACTS 



COMMODITIES FOR WHICH LEGAL WEIGHTS PER BUSHEL HAVE BEEN FIXED IN BUT ONE OR 



TWO STATES Continued 

 (From Bureau of Standards. Department of Commerce and Labor) 



WALL PAPER 



The following table from the " New York Newsdealer" 

 shows how many rolls of wall-paper are required to 

 cover a room of the dimensions indicated by the figures 

 in the left-hand column, also the number of yards of 

 border necessary. 



Deduct one-half roll of paper for each ordinary door 

 or window extra size 4x7 feet. 



PIPES 



Usual inclination of pipes. 



1 in. in 12 ft. ^ minimum fall for house drains; 



1 in. in 16 ft. minimum fall for land drains; 



1 in. in 40 ft.^= minimum fall for sub-drains for In .us-s ; 



1 in. in 100 ft. minimum fall for main drains for 

 houses; 



1 in. in 150 ft.= fall of mountain torrents; 



1 in. in 230 ft.= fall of rivers and rapid currents; 



1 in. in 280 ft.= fall of strong currents; 



1 in. in 340 ft. fall of ordinary rivers with good cur- 

 rents ; 



1 in. in 440 ft.= fall of winding rivers subject to inun- 

 dations with slow current; 



1 in. in 480 ft.= fall of water channels, supply pipes to 

 reservoirs and small canals; 



1 in. in 570 ft.= fall of large canals; 



1 in. in 1,000 ft.= very slow current, approaching to 

 stagnant water. 



Discharge through pipes. 



Discharge in 24 hours divided by 1,440 = discharge 

 per minute; discharge in cubic feet per minute X 9,000 



imperial gallons per day of 24 hours; discharge in 

 cubic feet per minute X 11,000 = United States gallons 

 per day of 24 hours; discharge in cubic feet per second 

 X 2.2 cubic yards per minute; discharge in cubic feet 

 per secpnd X 6.24 = imperial gallons per second] dis- 

 charge in cubic feet per second X 7.48 = United States 

 gallons per second; discharge in cubic feet per second 

 x 133 = cubic yards per hour; discharge in cubic feet 

 per second X 375 imperial gallons per minute; dis- 

 charge in cubic feet per second X 450 = United States 

 gallons per minute; discharge in cubic feet per second 

 X 2,400 = long tons per day of 24 hours; discharge in 

 cubic feet per second X 2,700 = short tons per day of 24 

 hours; velocity in feet per second X 0.68 = mile per 

 hour; velocity in feet per second X 60 = feet per minute ; 

 velocity in feet per second X 20 = yards per minute; 

 pressure head of water in feet - pressure of water in 

 pounds per square foot X 0.016; pressure of water in 

 pounds per square foot head in feet X 62.32. 



HARDNESS OF MINERALS 



Talc. 

 Rock Salt, 



Scratched by finger nail. 



Calcite, 1 



Apatite \ Scratched bv a knife blade - 



Orthoclase, j 



Quartz, 1 

 Topaz, 



Corundum, j" 

 Diamond, 



M:iy be roughly distinguished by a 

 file. 



