This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ...over 10,000 waggon-loads of sand, from the sand dunes at La Barra, were brought by the returning empty waggons. After an examination of the various sources of rock, it was decided to open a quarry at a point called El Abra, 78 miles from the work, where there was a rock bluff about 100 feet high near the railroad, with sufficient room for sidings. The rock is limestone, not suitable for dimension work, but producing very good rubble of any size. Its weight is between 162 and 172 lbs. per cubic foot, which is nearly the weight of ordinary granite. Another quarry was opened on one of the tributaries of the Panuco, from which about 9,000 cubic yards of rock were obtained of an inferior quality, and weighing only about 145 lbs. per cubic foot. The total amount of brushwood used on...

Под заказ:
	OZON.ru - 4057 руб.	Перейти

Рейтинг книги: 4 из 5, 5 голос(-ов).