_____(Q) The pink sand turned out to be fine volcanic ash and they had inadvertently produced the first 'pozzolanic' cement.
_____(U) But Ferris's quiet yet enthusiastic manner inspired confidence and the Ferris Wheel Company was eventually capitalized at $600,000.
_____(Q) Living under conditions scarcely better than their days in slavery, steel drivers labored in hard, dirty, cramped and life-threatening circumstances to drill through the living granite heart of the Appalachians.
_____(R) From the isolated, brawling. death-defying lives of these men, stories arose - some true, some imaginary - to inspire, amuse and entertain the workers: the most enduring of these, in song and myth, is the Legend of John Henry.
_____(S) The partner held in place a steel shaft with a cutting head that the "driver," often working from awkward angles, forced into the native stone with repeated strikes of his hammer.
_____(T) To do this, a steel driver worked with a partner.
_____(U) Once the shaft had cut a hole sufficiently deep, a blaster would pack the hole with explosives and blow another notch into the tunnel.
_____(S) Furthermore, he argued, the statement “I am” (sum) expresses an immediate intuition, not the conclusion of dubious reasoning, and is thus indubitable.
_____(U) In conclusion, therefore, whatever I know, I know intuitively that I am.