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UNCLE SAM’S MAPS 81

100’ X 780760 (1+.00366X22) - 94<% cc- = �°9498 literl

.09498X.09 = .008908i g. of H.24.3 2.016Mg+H^= MgSOd-2 Hx .008908

24.3 : 2.016 = x : .008Q08, X = .107 g. of Mg.237. From the same source as 236.One gram of pure iron forms 1.43 gm. of an oxide. Find (a) the

percentage composition for this oxide of iron, (&) its simplest formula,and (c) the equivalent weight of iron in the compound. (Fe = 56,0 = 16.)

Solution by Jessie Caplin, West High School^ Minneapolis^ Minn.Also solved by R. W. Bpreman.

1.43 gm. is iron oxide.(a) 1 � 1.43 = % Fe = 70%.

43 � 1.43 == % 0 == 30%.

(&) 7%g=: 1.215. Divided by .62 = Fe,. ^3%6 = 1.88. Divided by .62 == Os. J(c) 1 : 43 :: x : 16

x == 37 == eq. wt.

VIRGINIA GREATEST SOAPSTONE STATE.In the production of soapstone, the United States ranks ’first among all

countries, and Virginia produces about twenty times asi much as the fourother producing states�Maryland, North Carolina, iRhode Island, andVermont. The waste from breakage in quarrying, sawing into slabs, man-ufacturing, and final transportation is so great as to render success in theindustry a matter of skillful manipulation. The value of the stone is inlarge measure proportionate to the work done upon it. In the roughit is valued at $2 or less a ton, but when sawed into slabs its value is in-creased to about .$15, and when made into laundry tubs it may attain avalue of about $30 a ton. The production of soapstone and talc in theUnited States is steadily increasing, according to the United States Ge-ological Survey, Department of the Interior. In 1900 it was 27,943 shorttons, in 1910 it was 150,716 tons, and in 1915 it was 186,891 short tons.

UNCLE SAM’S MAPS AT A PREMIUM.That Uncle Sam’s topographic maps are appreciated by public utility

corporations is shown by the fact that telephone companies throughoutthe United States are constant purchasers. These companies send fre-quent orders to the Geological Survey, Department of the Interior, forits maps in lots of 2i50 or 500, and occasionally when some big contracthas been landed as many as 1,000’ maps are ordered at a time for the useof the engineers and linemen. Some electrical supply companies keepcomplete sets of the maps of areas in states in which they expect to doextended work, and when they hear that contracts are to be let for suchwork they refer to these maps, and with the "lay of the land" before themcan tell at a glance the character of the work that will be required and canmake their bids promptly and intelligently. The telephone officials whoare "using the maps extensively^’ state to the Survey that they are of"indispensable value" in their work.