CONTENTS.--Vol. I (1897)--Vol. II (1898)--Vol. III (1899)--Vol. IV (1902)--Vol. V (1905)--Vol. VI (1906)--Vol. VII (1908)--Vol. VIII (1909)--Vol. IX (1911)--Vol. X (1918)--Vol. XI (1922)--Vol. XII (1928)--Vol. XIII (1937)--Vol. 14 (1941)
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air-shrinkage alumina Amount spent Appalachian Arundel clay Avenue Baltimore beds Bodkin Point brick brick-clays briquette burning Cambrian carbonate Carboniferous Cecil county cement cent chemical clay-working Coastal Plain color condition cone 27 contain County Commissioners Devonian District Elkton erosion Fahr feet feldspar Ferric oxide fire-clay fluxes formation Fund furnace Geol glaze grades grains granites gravel Harford County Highway Division Hill improvement incipient fusion iron kaolin kaolinite kiln land Levy on hand lime limestone macadam machine manufacture Maryland MARYLAND GEOLOGICAL SURVEY mass material mica miles mineral mold Mountain occur outcrops Paleozoic particles Patapsco Patuxent paving-brick Plate pottery Prince George's county quartz Raritan refractory residual clays river Road Commissioners road-bed rocks sand sandstone sea-level sedimentary sediments shale shore silica Silurian square inch stone stoneware strata surface temperature tensile strength terra cotta thickness tion total shrinkage Valley vitrified ware washed
Seite 174 - America, to -which payment well and truly to be made we bind ourselves, our heirs, executors, and administrators, jointly, and severally, by these presents. Sealed with our seals and dated this day of...
Seite 173 - Maryland, in the sum of dollars ($ ), to be paid to the said , or their certain attorney, their successor and assigns, for which payment well and truly to be made, we bind ourselves, our heirs, executors and administrators, jointly and severally, by these presents. Sealed with our...
Seite 170 - Where no change, from the present grade of those portions of the road not already surfaced with stone, is shown on the profile, the road-bed is to be shaped to the proper cross-section and slight elevations with contiguous depressions removed so as to form an even and smooth surface. The road-bed is to be rolled to a firm, smooth surface before the application of the broken stone.
Seite 174 - THE CONDITION OF THIS OBLIGATION IS SUCH that if the said principal shall well and truly keep and perform all the terms and conditions of the...
Seite 175 - Embankments shall be formed of successive layers of not more than twelve (12) inches in thickness, each layer to be thoroughly rolled by a roller weighing not less than two tons. All trees, stumps, and roots within the roadbed and on slopes shall be grubbed up and removed as the engineer may direct, without additional compensation.
Seite 257 - If .08 and 1 are bent over and 5 is not affected, the temperature of the kiln is between 1 and 5. The next time numbers 2, 3 and 4 are put in, and 2 and 3 may be fused, but 4 remains unaffected, indicating that the temperature reached the fusing point of 3.
Seite 270 - The troughing has a slight pitch, commonly about one inch in 20 feet, but the amount depends on the kaolin, and whether the contained sand is fine or coarse. If the kaolin is very fine, and settles slowly, the pitch need not be so great, and vice versa. A large quantity of very coarse sand in the kaolin is a nuisance, as it clogs up the log washer and the upper end of the trough more quickly, causing much labor to keep them clean. As it is, considerable sand settles there, and, to keep the trough...
Seite 274 - The process in brief consists in feeding the dry clay into a pulverizer which reduces it to the condition of a very fine powder. As the material is discharged from the pulverizer into a long box or tunnel, it is seized by a powerful current of air which at once picks up the fine particles, carrying them along to the end of the airway, where they are dropped into a bin.
Seite 294 - The residual fire-clays found at Pomona and Grover are coarsegrained clays with much intermixed quartz and mica. The kaolins are of special importance and of excellent quality, the most important being at Webster and west of Sylva. Sedimentary clays. — The Coastal Plain deposits of North Carolina furnish the most extensive beds of clay to be found within the state. They have been classed as belonging to Cretaceous, Eocene and Pleistocene formations. The Potomac clays of the Cretaceous...
Seite 285 - Now, as each of these three compounds of the kaolin — clay substance, quartz and feldspar — have characteristic properties, the kaolin will vary in its behavior according as one or the other of these constituents predominates or tends to. increase. As to the characters of these three, quartz is nearly infusible, nonplastic, has very little shrinkage, and is of low tensile strength ; feldspar is easily fusible, and alone has little plasticity ~T kaolinite is plastic and quite refractory, but shrinks...