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 Baltimore county base beds blocks boundary building stones Canal Carroll counties Cecil county Chesapeake Bay chronometer Coast and Geodetic Cockeysville color considerable contours correction Creek cubic Delaware detailed distance drawn east Eastern Shore Ellicott City errors feet feldspar formations Frederick Frederick counties furnished gabbro Garrett counties Geodetic Survey Geologist gneisses grains granite Harford county Herman inch indicated instrument joints land later latitude limestones marble material means measured method miles Mountain observations obtained operated Peach Bottom Piedmont Plateau Plate points Port Deposit portion Potomac present published quarries quartz Railroad region represented Ridge river roads rock sandstone scale sheet sketch slates Smith star station surface Susquehanna telescope territory tests tion topographic traverse triangulation U. S. Coast U. S. Geological Survey Virginia Washington weight western
Beliebte Passagen
Seite 350 - 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.
Seite 338 - 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 346 - 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 386 - Geographical, Historical, Political, Philosophical and Mechanical Essays. The First, Containing An Analysis Of a General Map of the Middle British Colonies In America...
Seite 350 - 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 287 - The effect of the error of inclination on the circle reading for any direction varies as the tangent of the altitude of the object observed. If the inclination is small, as it may always be by proper adjustment, its effect will be negligible in most cases. But if the objects differ much in altitude, as in azimuth work, the inclination of the axis must be carefully measured with the striding level, so that the proper correction can be applied. The following formula includes the corrections to the...
Seite 316 - This table is supported by a tripod of light construction, without leveling apparatus, the leveling of the instrument being effected with sufficient accuracy by the tripod legs. A single screw fastens the board to the tripod head, and the adjustment in azimuth is made by simply turning the board with the hand. It is held in place by friction. The table is adjusted in azimuth, or oriented, by means of the compass needle; that is, it is turned until the needle rests opposite the zero marks in the compass...
Seite 386 - A Map of Pensilvania, New-Jersey, New York, And the Three Delaware Counties: By Lewis Evans. MDCCXLIX.
Seite 425 - Castle semi-circle, it should be run further northward until it reached the same latitude as fifteen English statute miles due south of the most southern part of the city of Philadelphia; that from the northern point of such line, a due west line should be run at least for the present, across the Susquehanna river, and twenty-five miles beyond it, — and to the western limits of Pennsylvania when occasion and the improvements of the country should require; that that part of the due west line not...
Seite 382 - Potowmack: with the courses of the rivers Rappahannock and Potowmack in Virginia, as surveyed according to order in the years 1736 & 1737.