Text from image: "Knowing What We Defend is Important, Too. The Washington Monument is built of stone contributed by all the nations of the earth to honor the founder of this republic. From Arlington, across the river, where sleep the men who died...
Periodicals; Chemical industry; Explosives; Dynamite;
Table of Contents: Conservation; Excavating Lake Washington Canal; Dependability; Smokeless Bananas; Ballistite Unhurt by Three Months' Immersion; Practical Explosives Efficiency; Two or More Electric Blasting Caps in a Bore Hole; Depth of Charges...
Table of Contents: The 139th year; Camphor in U.S.A.; Knowing what you buy; Spring 1941 introduces a new silhouette; Continental divide tunnel; Mother's new little helper; Furniture finished in Fabrikoid;
Kemble reports that the agents who have enquired about buying 100,000 pounds of powder are interested in knowing how DuPont powder compares to the French standard.
