Oil and Gas Fields of the Carnegie Quadrangle, Pennsylvania, Issues 456-463 |
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100 feet north 15 feet 20 feet east 20 feet south 50 feet aluminum tablet stamped bench mark bridge bronze tablet stamped center of sec center of track corner fence corner of sec Creek east of track east side feet east feet north feet south feet southeast feet west fence corner Fifth sand Fifty-foot sand forks of road Fourth sand front of station Gordon sand Hundred-foot sand iron post stamped Lake miles east miles north miles northeast miles southwest Milwaukee & St nail marked north of center north of road north side NORTHERN PACIFIC RAILWAY northwest corner Pittsburg Pittsburg coal post office post stamped Prim quadrangle quarter corner River road crossing rock sandstone schoolhouse side of road side of sec south of station south of track south side southeast corner thence south Thirty-foot sand top of rail Township trail Trav west of road west of station west side yard
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Page 3 - on tablets or posts. For such areas corrections for published results will be made from time to time as the preciselevel lines of the United States Geological Survey or other Government organizations are extended.
Page 4 - I). The numbers stamped on the bench marks described in the following pages represent the elevations to the nearest foot, as determined by the levelman. These numbers are stamped with T^g-inch steel dies on the tablets or post caps, to the left of the word "feet.
Page 66 - COUNTIES. The elevations in the following list were determined by primary leveling extended from the Coast and Geodetic Survey precise level line along the Alabama & Vicksburg Railway (Queen & Crescent Route).
Page 3 - The names of the various levelmen are given in the introduction to each list. The office work of computation, adjustment, and preparation of lists was done mainly by SS Gannett, geographer, and DH Baldwin, topographer, and since 1907 under the general direction of EM Douglas, geographer.
Page 3 - The connection with tidal stations for bench marks in certain areas that lie at some distance from the seacoast is still uncertain, and this fact is indicated by the addition of a letter or word to the right of the word " Datum
Page 4 - This level is not the elevation determined from the mean of the highest and the lowest tides, nor is it the half sum of the mean of all the high tides and the. mean of all the low tides, which is called the half-tide level. Mean sea level is the average height of the water, all stages of the tide being considered. It is determined from observations made by means of tidal gages placed at stations where local conditions, such as long, narrow bays, rivers, arid like features, will not affect the height...
Page 4 - I), 3^ inches in diameter and one-quarter inch thick, having a 3-inch stem, which is cemented in a drill hole in solid rock in the wall of some public building, a bridge abutment, or other substantial masonry structure. The second form (F, PI.
Page 4 - ... were eliminated. This level is not the elevation determined from the mean of the highest and the lowest tides, nor is it the half sum of the mean of all the high tides and the mean of all the low tides, which is called half-tide level.