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 ~ Total crushed
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— — — — —.
IC — — — — 0_____

—
— — — — —
&ment manufacture
—' Calcium carbide manufacture
Lime manufacture nailroed ballast
Refractory stone Flux stone
1922 25 ' 24 ' 25 ' 26 ' 27 ' 28 29 - ' 50 .51 - -

FIGURE 61.—Comparison of trends in principal uses of crushed and broken
stone, 1922-32. In the above graph the annual quantity indicated for each
principal use is expressed as a percentage of the quantity produced in 1922
for the same purpose.
CRUSHED AND BROKEN STONE