The declaration was adopted prohibiting the throwing of projectiles and explosives from balloons.
"History of the United States, Volume 6 (of 6)"
E. Benjamin Andrews
We must therefore look upon them as so many projectiles, bullets, fired against the earth from some outside source and arrested in their motion by the earth's atmosphere, which serves as a cushion to protect the ground from the bombardment which would otherwise prove in the highest degree dangerous to both property and life.
"A Text-Book of Astronomy"
George C. Comstock
The rapid-fire gun is smaller than the great cannon mounted in the turrets; but, while the latter have their proper usefulness, the immensely larger number of projectiles fired in a given time, and valid against the target presented to them, makes the rapid-fire battery a much stronger weapon, offensively, than the slow-acting giants.
"Lessons of the war with Spain and other articles"
Alfred T. Mahan