Geographical and Geological SurveysWelch, Bigelow, 1875 - 96 strani |
Iz vsebine knjige
Zadetki 1–5 od 14
Stran 5
... taken in at a glance . These natural features are rivers , lakes , oceans , mountains ; the artificial constructions are streets , roads , buildings , railroads , canals , and the like ; the artificial lines . which need to be indicated ...
... taken in at a glance . These natural features are rivers , lakes , oceans , mountains ; the artificial constructions are streets , roads , buildings , railroads , canals , and the like ; the artificial lines . which need to be indicated ...
Stran 6
... vertical element is of great im- portance , a model may often be of great assistance and indeed almost indispensable . A photograph from a model gives , if taken with skill , under a suitable illumination , a wonderfully clear idea of the ...
... vertical element is of great im- portance , a model may often be of great assistance and indeed almost indispensable . A photograph from a model gives , if taken with skill , under a suitable illumination , a wonderfully clear idea of the ...
Stran 9
... taken from such a model , with the rays descending vertically on it , the illu- sion or perception of the relief of the surface would be en- tirely lost . The same thing can be done , although less per- fectly , by a skilful handling of ...
... taken from such a model , with the rays descending vertically on it , the illu- sion or perception of the relief of the surface would be en- tirely lost . The same thing can be done , although less per- fectly , by a skilful handling of ...
Stran 27
... taken into the field , and fewer still of good observers who went with them . A delay of a few months in beginning the work , supposing the interval to have been devoted to preparing suitable instruments and training observ- ers in ...
... taken into the field , and fewer still of good observers who went with them . A delay of a few months in beginning the work , supposing the interval to have been devoted to preparing suitable instruments and training observ- ers in ...
Stran 44
... taken into consideration . From what has been said above , it will be readily gathered that we have very poor local maps of the Eastern States , and no good general one . One would suppose that the grand chain of the Appalachians ...
... taken into consideration . From what has been said above , it will be readily gathered that we have very poor local maps of the Eastern States , and no good general one . One would suppose that the grand chain of the Appalachians ...
Druge izdaje - Prikaži vse
Pogosti izrazi in povedi
accuracy already amount astronomical Atlantic Basin California chiefly Clarence King coal Coast Survey Colorado commenced Congress connected considerable continent contour lines corps determined distance earth École des Mines Engineer Bureau England eral Europe expedition expenditure exploration extended feet Fortieth Parallel Survey Fremont furnish geological map geological structure geological survey geologist given gold hill-shading idea important inch indicated interior investigation knowledge known Lake Lake Superior Land Office Surveys longitude Massachusetts material matter meridian metalliferous mineral lands mining school nearly obtained Ordnance Survey Pacific Pacific Railroad Surveys Pennsylvania points portion position present primary triangulation Professor James Hall progress Prussia published purpose Railroad ranges reconnoissance regard region west Report River rocks Rocky Mountains scale scientific sections sheets Sierra Nevada square miles surface territory tion topographical map topographical survey triangulation United States Engineer vertical
Priljubljeni odlomki
Stran 69 - Mining claims upon veins or lodes of quartz or other rock in place bearing gold, silver, cinnabar, lead, tin, copper, or other valuable deposits, heretofore located, shall be governed as to length along the vein or lode by the customs, regulations, and laws in force at the date of their location.
Stran 68 - An act granting the right of way to ditch and canal owners over the public lands, and for other purposes...
Stran 34 - For extending the triangulation of the coast survey so as to form a geodetic connection between the Atlantic and Pacific coasts of the United States...
Stran 68 - All valuable mineral deposits in lands belonging to the United States, both surveyed and unsurveyed, are hereby declared to be free and open to exploration and purchase, and the lands in which they are found to occupation and purchase, by citizens of the United States...
Stran 69 - States and those who have declared their intention to become citizens, subject to such regulations as may be prescribed by law, and subject also to the local customs or rules of miners in the several mining districts, so far as the same may not be in conflict with the laws of the United States.
Stran 16 - Baden, the new map was commenced in 1874, on a scale of 1 : 25,000, and with contour.lines at 10 metres' distance. The work is mainly a revision and correction of older surveys, and is expected to occupy six years, at a cost of about 80,000 florins. In Saxony, the original survey was commenced in 1780 and completed in 1806 on a scale of 1 : 12,000, the area of the kingdom being 5,600 square miles. A topographical map was issued in the years 1837-1860, in 22 sheets and on a scale of 1 : 57,600. A...
Stran 93 - All the attempts at working them have, however, proved to be unprofitable ventures ; although a great deal of money has been spent in this way at various times since 1765. The same has been the case with the other metalliferous veins of New England ; almost without exception the mines which have been opened on them have been disastrous failures. Eaton, Shelburne, and Warren, in New Hampshire, may be cited as typical localities, where flattering surface indications have led to extensive mining operations,...
Stran 39 - ... and base line to check the surveys, but what are called guide meridians and correction lines or standard parallels have been instituted, which are all run as nearly as human skill can effect it upon true meridians and parallels of latitude.
Stran 16 - ... 25,000, and with contour lines at distances of 5, 12|, or 25 feet, according to the nature of the country. The publication of the plane-table sheets was commenced in 1868, and in 1873 120 had been issued. There has also been, since 1841, a general map in process of publication, on a scale of 1 : 100,000, which will be comprised in some 400 sheets, of which nearly all are issued. These are engraved on copper and have the topography, or hillshading, indicated according to Lehmann's system, as modified...
Stran 68 - An act to promote the development of the mining resources of the United States," approved May tenth, eighteen hundred and seventytwo.