Report, Band 9Johns Hopkins Press, 1911 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. XIV (1941) |
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Seite 27
... cost for construction , supervision and mainte- nance . It is accompanied by a new map showing the main roads of the State , the roads improved by the Highway Division of the Survey and by the State Roads Commission . ( Issued Mar ...
... cost for construction , supervision and mainte- nance . It is accompanied by a new map showing the main roads of the State , the roads improved by the Highway Division of the Survey and by the State Roads Commission . ( Issued Mar ...
Seite 37
... cost as an incidental consideration . All returned with renewed and strengthened confidence in American methods and En- gineers , in itself no small factor toward success . The general agreement of road authorities as to the necessity ...
... cost as an incidental consideration . All returned with renewed and strengthened confidence in American methods and En- gineers , in itself no small factor toward success . The general agreement of road authorities as to the necessity ...
Seite 40
... cost over $ 853,370 , have been under construction . Of these 62 miles have been finished , making a total of 114 miles completed under the Act to date , and there are now outstanding 26 contracts for 4511⁄2 miles aggregating about ...
... cost over $ 853,370 , have been under construction . Of these 62 miles have been finished , making a total of 114 miles completed under the Act to date , and there are now outstanding 26 contracts for 4511⁄2 miles aggregating about ...
Seite 42
... cost may be entirely justified by the subsequent reduction in annual main- tenance charges . This question of maintenance receives far more attention abroad than in this country and the opinion so generally formed by visitors as to the ...
... cost may be entirely justified by the subsequent reduction in annual main- tenance charges . This question of maintenance receives far more attention abroad than in this country and the opinion so generally formed by visitors as to the ...
Seite 41
... cost of the modern roads is gradually dying out . At first , five thousand dollars per mile seemed to many an utterly unreasonable figure to expect to reach in construction . After a few pieces had been finished , however , even seven ...
... cost of the modern roads is gradually dying out . At first , five thousand dollars per mile seemed to many an utterly unreasonable figure to expect to reach in construction . After a few pieces had been finished , however , even seven ...
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
50 feet abandoned Allegany County ANALYSIS Anne Arundel Anne Arundel County Ashland Baltimore County Bank bar iron blast boshes carbonate Carroll Catoctin Furnace Cecil County cent charcoal clay pipe Clinton coal construction cost Creek Cumberland deposits depth east side Engineer erected Fe SiO2 Federalsburg feet high feet in diameter feet long feet wide ferruginous forge Frederick County Friendsville Garrett County grade half mile Harford County hauled hematite Highway Division Hill Howard Howard County hundred yards Ignition Iron Company limestone limonite located Lonaconing macadam magnetite manganese Maryland mile east mile north mile northwest mile south mile southeast miles of road mill mined Mountain Muirkirk nodules northeast occur old opening operated outcrop output Patapsco Patuxent pig iron Principio Railroad relaid Ridgely River rocks royalty sandstone Savage schist shale southwest Stemmer Run stone surface Sykesville thickness tons Washington
Beliebte Passagen
Seite 258 - The large amount of this gas evolved from the beds of vegetable matter, undergoing change, would impart to the water of the adjoining strata the power of dissolving the diffused proto-carbonate, which, being then carried by infiltration through the more porous beds, would accumulate above and within the close argillaceous or shaly layers, forming, in some cases, bands of rock ore, in others, courses of nodular and plate ores. Of these, the former would seem to have resulted from the accumulation...
Seite 136 - An Act for the encouragement of an Iron manufacture within this Province. "WHEREAS, It is represented to this present General Assembly that there are very great conveniences of carrying on Iron Works within this Province which have not hitherto been embraced for want of proper encouragement to some first undertakers...
Seite 134 - Assembly of 1719 passed an act for the encouragement of iron manufacture, in which it is stated " that there are very great conveniences for carrying on of iron works within this province, which have not hitherto been embraced for want of proper encouragement to some first-class undertakers.
Seite 257 - ... sandstones, which are often crowded with the impressions and carbonized remains of plants, are at the same time more or less impregnated with this ferruginous compound. So, again, the soft argillaceous shales, in the midst of which the lenticular ore so frequently presents itself, show, by their dark color and included impressions of plants, as well as by actual analysis, that they are richly imbued with vegetable matter. Nor do the nearly white fire-clays, which in many cases enclose thick courses...
Seite 258 - In this process, which finds a simple explanation in the combined action of infiltration and the segregating force, it can hardly be questioned that the carbonic acid, pervading the mass of sediment, acted a very important part. The large amount of this gas evolved from the beds of vegetable matter, undergoing change, would impart to the water of the adjoining strata the power of dissolving the diffused proto-carbonate, which, being then carried by infiltration through the more porous beds, would...
Seite 258 - ... the close argillaceous or shaly layers, forming, in some cases, bands of rock ore, in others, courses of nodular and plate ores. Of these, the former would seem to have resulted from the accumulation by gravity of the dissolved carbonate in the substance of sandy shales, near the upper limit of the more impervious beds, while we may regard the latter as having been collected in all directions from the general charge of proto-carbonate accumulated in the argillaceous mass, its mobility in the...
Seite 151 - Daniel and Samuel Hughes were proprietors of an air furnace in Frederick County (afterward made Washington County). On July 1, 1776, the Maryland Convention authorized the Council of Safety to lend the proprietors for nine months the sum of £200 common money, to encourage them 'to prosecute their cannon foundry with spirit and diligence.
Seite 134 - ... all of these factors are favorable a comparatively low grade ore can readily be utilized at a profit, whereas many high grade ores less favorably situated are absolutely worthless. HISTORY OF THE MARYLAND IRON INDUSTRY. THE COLONIAL PERIOD. The credit of the discovery of iron ore in Maryland seems to belong to Captain John Smith. In his voyage up the Chesapeake Bay in 1608, he entered the Patapsco River which he named Bolus, because of the red clay found there, resembling "bole armoniack and...
Seite 258 - The gathering of the diffused Proto-Carbonate into bands and courses of ore began no doubt as soon as the production of this compound had made some progress, but it probably continued until long after the completion of the chemical changes above described ; and indeed, it is possible that in some strata it is not yet entirely finished. In this process, which finds a simple explanation in the combined action of infiltration and...
Seite 138 - that no forge, going by water, or other works should be erected in any of the said plantations, for the making, working, or converting of any sows, pigs, or cast-iron into bar or rod iron.