Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 43 · column 3 of 6 · from the scan, no model involved
Greener
Mining one pqund of clay .produces nearly one pound of ibrick with only slight moisture and mineral loss. In comparison, up to 70 percent of the ore used in making steel amounts to waste. The figure is even higher for aluminum — up to 88 percent of the ore used is waste.
The amount of energy needed to produce brick is lower than most competing building materials. It takes 50 times more energy to produce one pound of aluminum than to produce the same amount of brick.
Brick manufacturing conserves energy in another way as well. Virtually all U.S. brick plants are located within a 20mile radius of their manufacturing facility, minimizing the energy expended in transporting the raw material to manufacturing sites. No raw clay is imported into the U.S., while approximately 90 percent of the ore used for aluminum and about 25 percent used for steel must be imported. From Page 12
95.9%