150 



THE IRRIGATION AGE. 



The Metric System was legalized In the United States on July 28, 1806, when COOKTUU euacUd as 

 follows : 



"Tbe tables in the schedule hereto annexed shall be recognised In toe construction of contracts 

 and la !! legal proceedings, aa etHabH-thing. in terms of the weigh IB and mfasun-s now in use tti tin'- 

 United et*tes. tlie equivalent of Hie weights and measures expressed (herein hi term* of the metric 

 system, nd the tables may lawfully be used for computing, determining, and expressing tn custoiu- 

 ary weights and measures the weights and mea-sure* of the metric system," 



The lollowlug are tue tables MUMMd to the above: 



HKABUREB or LKNOTH, 



To MEASURE CORN OR SIMILAR COMMODITY ON A FLOOR 

 Pile up the commodity in the form of a cone; find the diameter 

 in feet; multiply the square of the diameter by .7854, a n d the 

 product by one-third the height of the cone in feet;, from this last 

 product deduct one-fifth of itself, or multiply U by .803564, and 

 the result will be the number of bushels. 



CAPACITY OF CYLINDRICAL CISTERNS OR TANKS FOB 



EACH FOOT OF DEPTH (UNITED STATES GALLONS) 



FROM TWO TO FORTY FEET IN DIAMETER. 



CAPACITY OF DRAIN-PIPE. 



MKAHUKKS ur B 



Metric Jh-iiomlnattonK ami Values. 



Kqutvuieota la Denomination* In Use. 



Hectare 

 Are 



Criilare 



....................... 10.OOO square metre*. 



loOmjuare metres. 

 ..................... - 1 square metre. 



MKAMUHKK Ol' CAPACITY. 



For square or rectangular tanks, multiply the 

 length and breadth and depth together to get cubic 

 feet, then multiply by 1,728 to get cubic inches, and 



PRACTICAL MEASUREMENTS. 



To ASCERTAIN" THE WEIGHT OF CATTLE Measure the girt 



close behind the shoulder, and the length from the fore part of tho shoulder-blade 

 alpng the back to the bone at the tail, which is in a vertical line with the buttock, 

 both in feet. Multiply the square of the girt, expressed in feet, by ten times the 

 length, and divide the product by three; the quotient is the weight, nearly, of the 

 fore quarters, in pounds avoirdupois. It is to be observed, however, that in very fat 

 cattle the fore quarters will be about one-twentieth more, while in those in a very 

 lean state they will be one-twentieth less than the weight obtained by the rule. 



RULES FOR MEASURING CORN IN CRIB, VEGETABLES, ETC., 



AND HAV IN Mow This rule will apply to a crib of any size or kind. Two cubic 

 feet of good, sound, dry corn in the ear will make a bushel of shelled corn. To get, 

 then, the quantity of shelled corn in a crib of corn in the ear, measure the length, 

 breadth and height of the crib, inside the rail; multiply the length by the. breadth 

 and the product by the height, then divide the product by two, and you have the 

 Dumber of bushels of shelled corn in the crib. 



To find the number of bushels of apples, potatoes, etc., in a bin, multiply the 

 length, breadth' and thickness together, and this product by eight, and point off one 

 figure in the product for decimals. 



T find the amount of hay in a mow, allow 512 cubic feet for a ton, and it will 

 come out very generally correct 



To MEASURE BULK WOOD To measure a pile of woo\i 



multiply the length by the width, and that product by the height, which will jive 

 the number of cubic feet. Divide that product by 128, and the quotient will be the 

 nupiber of cords. A standard cord of wood, it must be remembered, is four feet 

 thick; that is, the wood must be four feet long.. Farmers usually go by surface 

 measure, calling a pile of stove wood eight feet long and four feet high a cord. Un- 

 der such circumstances thirty-two feet would be_thc divisor. 



How TO MEASURE A 



looking for a stick of timber, .ire at a loss t 



the length of timber it will cut. The following rule will enable any one to approxi- 



this product, divided by 231, the number of cubic 

 inches in a gallon, will give the number of gallons. 



QUANTITY OF WATER DISCHARGED PER STROKE BY A 

 SINGLE ACTING PDMP. 



The first column of figures indicates the diameter 

 of the pump cylinder in inches. The second column 

 gives the area of the cylinder. 



E Very many persons, when 



to estimate either the height of the tree or 



uring At this point a light pole and a measuring ruleare required. The polA is 

 raised between the eyes and the tree, and the rule is brought into position against 

 the pole. Then by sighting an<l observing what length of the rule is required to 

 cover the stake at the tree, and what the entire tree, dividing the. latter length by 

 the former and multiplying by the number effect the stake is long, you reach the 

 approximate height of the tre^. For example, if the stake at the tree- be six feet 

 above ground and one inch ' n your rule corresponds exactly with this, and if then 

 the entire height of the tre' corresponds exactly with say nine inches on the rule, 

 this would show the tree to possess a full height of fifty-four feet. In practice iv 

 will thus be found an easy matter to learn the approximate height of-any tree 

 building, or other such object. 



To MEASURE CASKS OR BARRELS 'Find mean diameter by 



adding to head diameter two-thirds (if staves are but slightly curved, three-fifths) of 

 difference between head and bung diameters, and dividing by two. Multiply square 

 of mean diameter in inches l>y -7854, and the product by the height of the cask in 

 -inches. The result will be the number of cubic inches. Divide by 231 for standard 

 or wine gallons, and by 282 for beer gallons. 



GRAIN MEASURE To find the capacity of a bin or wagon - 

 bed, multiply the cubic feet by .8 (tenths). For great accuracy, add J^-of a bushel 

 for every JOG cubic feet. To find the cubic feet, multiply the length, width and 

 depth together. 



Doublin 



