Chapter Ii.--Theory and Practice of Proportioning Concrete. 25

~Voids:~ Voids in Sand; Effect of Mixture--Effect of Size of Grains--Voids in Broken Stone and Gravel; Effect of Method of Loading; Test Determinations; Specific Gravity; Effect of Hauling--Theory of the Quantity of Cement in Mortar; Tables of Quantities in Mortar--Tables of Quantities in Concrete--Percentage of Water in Concrete--Methods of Measuring and Weighing; Automatic Measuring Devices.