Report, Band 2Johns Hopkins Press, 1898 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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accuracy alidade amount angles azimuth Baltimore county base beds blocks building stones Canal Cecil county Chesapeake Bay Cockeysville color considerable contours correction Creek crushing crystalline cubes cubic detailed direction distance east eastern Ellicott City errors feet feldspar formations Frederick Frederick counties freezing furnished gabbro Garrett counties Geologist gneiss grains granite Harford county Howard county indicated instrument joints later latitude limestones marble MARYLAND GEOLOGICAL SURVEY material means measured method micrometer microscope miles minerals Mountain observations obtained operated Peach Bottom plane Plate points Port Deposit portion Potomac pounds present published quarries quartz railroad represented Ridge river rock sandstone scale Seneca sheet shore sidereal sketch Smith specimens star station structure surface telescope territory tests texture tion topographic traverse triangulation Triassic U. S. Coast U. S. Geological Survey Virginia Washington weight western
Beliebte Passagen
Seite 346 - You must observe if you can, whether the river on which you plant doth spring out of mountains or out of lakes. If it be out of any lake, the passage to the other sea will be more easy, and [it] is like enough, that out of the same lake you shall find some spring which run[s] the contrary way towards the East India Sea...
Seite 331 - Moreover, the smaller the scale the higher must be the degree of generalization, and the further must the map necessarily depart from the original. Now, it is in this matter of generalization that the judgment of the topographer is most severely tested. He must be able to take a broad as well as a detailed view of the country, he must understand the meaning of its broad features, and then must be able to interpret details in the light of those features. Only such a man is competent to make just generalizations...
Seite 350 - These he wore in a woolues skinne at his backe for his quiver, his bow in the one hand and his clubbe in the other, as is described.
Seite 394 - A Map of Pensilvania, New-Jersey, New York, And the Three Delaware Counties: By Lewis Evans. MDCCXLIX." ' The latter abounds in interesting meteorological observations which may have originated with Evans' publisher, Benj. Franklin, while the former is frankly acknowledged in the "Analysis " to be a compilation of existing information supplemented by that gained through personal observations in many portions of the territory depicted. That he was regarded as a loyal Pennsylvanian who might allow...
Seite 38 - Maryland at the session of 1896, chapter 51, or so much thereof as may be necessary, bo and the same is hereby appropriated, out of any funds in the treasury not otherwise appropriated, and the said amount...
Seite 356 - Relation," which was entered at Stationer's Hall, London, August 13, 1608, under the following title, which differs from the printed one, as it mentions Nelson's name: "A true relation of such occurrences and accidents of note as have happened in Virginia synce the first planting of that Colonye which is nowe resident in the south parte of Virginia till master Nelson's comminge away from them, etc." The opinion that the map was finished before November of 1608 is based upon a letter which Smith wrote...
Seite 356 - I have sent you this Mappe of the Bay and Rivers, with an annexed Relation of the Countries and Nations that inhabit them, as you may see at large. Also two barrels of stones, and such as I take to be good Iron ore at the least; so devided, as by their notes you may see in what places I found them.
Seite 269 - ... both before and after reversal, separately. A comparison of the clock error, determined from observations upon north and south stars, will furnish the data necessary for the determination of azimuth. Practically, it is determined by elimination from equations involving the mean of all these stars observed in each of the two positions of the instrument, after correcting for level, and as it is slightly complicated with collimation it must be reached by two or more approximations. The error is...
Seite 321 - In level country, especially if it is covered with forests, it is very expensive to carry on triangulation, and in some cases practically impossible to do so. Under such circumstances the only means of obtaining an adequate control for maps is by means of traverse lines.
Seite 62 - ... the eye is that of a more or less complete absence of light, or darkness. Obviously, then, the more transparent the feldspars and the greater the abundance of dark minerals, the greater will be the contrast between hammered and polished surfaces. This is a matter worthy of consideration in cases where it is wished, as in a monument, to have a polished die, surrounded by a margin of hammered work to give contrast. The ordinary granites, while taking a high polish, do not afford such strong contrasts...