“[On the propulsive force of rockets] One part of fire takes up as much space as ten parts of air, and one part of air takes up the space of ten parts of water, and one part of water as much as ten parts of earth. Now powder is earth, consisting of the four elementary principles, and when the sulfur conducts the fire into the dryest part of the powder, fire, and air increase ... the other elements also gird themselves for battle with each other and the rage of battle is changed by their heat and moisture into a strong wind.” EarthScienceStrongForceWaterSpacePrinciplesFireFourAirChangedWindBattleTenElementsIncreaseRageHeatRocketsPowderMoistureStrong WindsSulfur Author:Vannoccio Biringuccio
“I have no knowledge other than that gained through my own eyes.” EyeScienceMy OwnKnowledge Author:Vannoccio Biringuccio
“The credulous ... advance the authority of hearsay in place of reasons for possible success or facts that can be demonstrated.” ReasonFactsScienceAuthorityHearsay Author:Vannoccio Biringuccio
