Annual Report for ..., Band 2

Cover
CONTENTS.--v. 1. pt. 1. Creation of a state geological survey, by H. Landes. An outline of the geology of Washington, by H. Landes. pt. 2. The metalliferous resources of Washington, except iron, by H. Landes, W. S. Thyng, D. A. Lyon and M. Roberts. pt. 3. The non-metalliferous resources of Washington, except coal, by H. Landes. pt. 4. The iron ores of Washington, by S. Shedd. The coal deposits of Washington, by H. Landes. pt. 5. The water resources of Washington. pt. 6. Bibliography of the literature referring to the geology of Washington, by R. Arnold.--v. 2. pt. 1. The building and ornamental stones of Washington, by S. Shedd. pt. 2. Coal deposits of Washington, by H. Landes and C. A. Ruddy.
 

Andere Ausgaben - Alle anzeigen

Häufige Begriffe und Wortgruppen

Beliebte Passagen

Seite 150 - An important feature of these joints, as mentioned by this authority, is the direction in which they intersect each other. In general they have two dominant trends, one coincident on the whole with the direction in which the strata are inclined from the horizon, and the other running transversely at a right angle, or nearly so. The first are called "dip joints
Seite 24 - Ibs. per square inch. There is scarcely a building stone of importance in the country that does not give a higher test than this. Ordinary building stone has from two to ten times the maximum required crushing strength. A stone, having a crushing strength of 5,000 Ibs. per square inch, is sufficiently strong for any ordinary building.
Seite 272 - Coke produced (short tons) Total value of coke at ovens Value of coke at ovens, per ton Yield of coal in coke...
Seite 23 - Ibs. per square inch. Certain contractors require a stone to withstand twenty times the pressure to which it will be subjected in the wall, while others only require ten times that pressure. Even if requiring a factor of safety of twenty, the strength required for a stone at the base of this monument would be only 6,292 Ibs.
Seite 92 - The mineral b is pale green, and intermingled with a. Its birefringence yields weak colors, quite characteristic of chlorite. In quantity it is less than one-fourth of a. Mineral c is granular, in scattered grains and irregular groups with a high index of refraction and a birefringence which suggests a carbonate, but it does not effervesce with a dilute acid. It amounts to not more than 5 per cent. of the whole. Mineral b is certainly chlorite, and a may be brucite or possibly serpentine.
Seite 153 - Ledge. Any natural solid body of rock. Lewis hole. The Lewis* hole consists of a series of two or more holes drilled as closely together as possible, and then connected by knocking out the thin partition between them, forming thus one wide hole, having its greatest diameter in a plane with the desired rift. Blasts from such holes are wedge-like in their action, and by means of them larger and better-shaped blocks can be taken out than would otherwise be possible.
Seite 149 - As a rule, they are most sliarply defined in proportion to the fineness of grain of the rock. In limestones and close-grained shales, for example, they often occur so clean-cut as to be invisible until revealed by fracture or by the slow disintegrating effects of the weather. The rock splits up along these concealed lines of division, whether the agent of demolition be the hammer or frost. In coarse-textured rocks, on the other hand, joints are more apt to show themselves as irregular sinuous rents.
Seite 150 - ... nature of the rock in which they occur, sometimes being so fine as to be almost imperceptible, or again perfectly distinct and capable of being traced for many yards, or even miles. In stratified rocks (limestones, sandstones, schists, etc.), according to Professor Geikie, the joints, " as a rule," run perpendicular, or approximately so, to the planes of bedding, and descend vertically at not very unequal distances, so that the portions of the rock between them, when seen from a distance, appear...
Seite 92 - In this, four minerals appear instead of three, but the microscopic examination did not attempt to discriminate between the brucite and the serpentine. In order to obtain evidence confirmatory of the foregoing conclusions, a few experiments were made, tending towards fractional determinations.
Seite 91 - National Museum show that the output of the locality is far from uniform. They range from a white carbonate, through various intermediate mixtures of the verde antique type, to material which appears to be ordinary serpentine. The latter, however, as shown by the serpentine under consideration, is distinctly laminated in structure, and exhibits a splintery fracture. An analysis by Mr. George Steiger gave the following results: SiO2 13.08 A12O2 1.63 Fe2()8 1.

Bibliografische Informationen