Chapter

 1 VII  |   this distance, any objects sixty feet square would be perfectly
 2 VII  |     projectile a diameter of sixty feet?”~“Not so.”~“Do you
 3 IX   |    uses only one hundred and sixty pounds of powder to send
 4 IX   |    more than one hundred and sixty pounds.”~“What are you aiming
 5 X    |    distance of from fifty to sixty miles separated them from
 6 XIV  |   have, therefore, a well of sixty feet in diameter to dig
 7 XIV  | Stones Hill, a circular hole sixty feet in diameter. The pickaxe
 8 XVI  |    against which iron plates sixty feet thick would have been
 9 XIX  |    equal to that of fifty or sixty atmospheres without being
10 XXIV |     and objects of less than sixty feet in diameter, unless
11 VI   |      moon to the earth being sixty terrestrial radii, the length
12 XXIII|     speed of one hundred and sixty miles in the hour. But what