1 As when that devilish iron engine, wrought 2 In deepest hell, and framed by Furies' skill,
framed > fashioned
3 With windy nitre and quick sulphur fraught,
windy > {Generating wind, gas} nitre > {Saltpetre or potassium nitrate, a component of gunpowder} quick > readily inflammable fraught > filled
4 And rammed with bullet round, ordained to kill,
bullet > cannon-ball
5 Conceives fire, the heavens it does fill
Conceives fire > Detonates
6 With thundering noise, and all the air does choke, 7 That none can breathe, nor see, nor hear at will,
That > [So that]