Standard numbered notes for description of marks
The following notes have been used for many years in published descriptions and other publications of the Coast and Geodetic Survey.
Surface marks
- Note 1.-A standard triangulation-station disk set in the top of
- (a) a square block or post of concrete,
- (b) a concrete cylinder,
- (c) an irregular mass of concrete.
- Note 2.-A standard triangulation-station disk cemented in a drill hole in outcropping bedrock,
- (a) and surrounded by a triangle chiseled in the rock,
- (b) and surrounded by a circle chiseled in the rock,
- (c) at the intersection of two lines chiseled in the rock.
- Note 3.-A standard triangulation-station disk set in concrete in a depression in outcropping bedrock.
- Note 4.-A standard triangulation-station disk cemented in a drill hole in a boulder.
- Note 5.-A standard triangulation-station disk set in concrete in a depression in a boulder.
- Note 6.-A standard triangulation-station disk set in concrete at the center of the top of a tile
- (a) which is embedded in the ground,
- (b) which is surrounded by a mass of concrete,
- (c) which is fastened by means of concrete to the upper end of a long wooden pile driven into the marsh,
- (d) which is set in a block of concrete and projects from 12 to 20 inches above the block.
Underground marks
- Note 7.-A block of concrete about 3 feet below the ground containing at the center of its upper surface
- (a) a standard triangulation-station disk,
- (b) a copper bolt projecting slightly above the concrete,
- (c) an iron nail with the point projecting above the concrete,
- (d) a glass bottle with the neck projecting a little above the concrete,
- (e) an earthenware jug with the mouth projecting a little above the concrete.
- Note 8.-In bedrock,
- (a) a standard triangulation-station disk cemented in a drill hole,
- (b) a standard triangulation-station disk set in concrete in a depression,
- (c) a copper bolt set in cement in a drill hole or depression,
- (d) an iron spike set point up in cement in a drill hole or depression.
- Note 9.-In a boulder about 3 feet below the ground
- (a) a standard triangulation-station disk cemented in a drill hole,
- (b) a standard triangulation-station disk set in concrete in a depression,
- (c) a copper bolt set with cement in a drill hole or depression,
- (d) an iron spike set with cement in a drill hole or depression.
- Note 1O.-Embedded in earth about 3 feet below the surface of the ground
- (a) a bottle in an upright position,
- (b) an earthenware jug in an upright position,
- (c) a brick in a horizontal position with a drill hole in its upper surface.
Reference marks
- Note 11.-A standard reference-mark disk, with the arrow pointing toward the station, set at the center of the top of
- (a) a square block or post of concrete,
- (b) a concrete cylinder,
- (c) an irregular mass of concrete.
- Note 12.-A standard reference-mark disk, with the arrow pointing toward the station,
- (a) cemented in a drill hole in outcropping bedrock,
- (b) set in concrete in a depression in outcropping bedrock,
- (c) cemented in a drill hole in a boulder,
- (d) set in concrete in a depression in a boulder.
- Note 13.-A standard reference-mark disk, with the arrow pointing toward the station, set in concrete at the center of the top of a tile
- (a) which is embedded in the ground,
- (b) which is surrounded by a mass of concrete,
- (c) which is fastened by meam of concrete to the upper end of a long wooden pile driven into the marsh,
- (d) which is et in a block of concrete and projects from 12 to 20 inches above the block.
Previously used notes 14 and 15 referred to seldom-used types of witness mark and are purposely omitted.
Azimuth marks
Azimuth-mark notes are almost identical to reference-mark notes 11 through 13, which have been previously used for azimuth marks. The following numbers 16, 17, and 18, are to refer specifically to azimuth-mark disks.
- Note 16.-A standard azimuth-mark disk, with the arrow pointing toward the station, set at the center of the top of
- (a) a square block or post of concrete,
- (b) a concrete cylinder,
- (c) an irregular mass of concrete.
- Note 17.-A standard azimuth-mark disk, with the arrow pointing toward the station,
- (a) cemented in a drill hole in outcropping bedrock,
- (b) set in concrete in a depression in outcropping bedrock,
- (c) cemented in a drill hole in a boulder,
- (d) set in concrete in a depression in a boulder.
- Note 18.-A standard azimuth-mark disk, with the arrow pointing toward the station, set in concrete at the center of the top of a tile
- (a) which is embedded in the ground,
- (b) which is surrounded by a mass of concrete,
- (c) which is fastened by means of concrete to the upper end of a long wooden pile driven into the marsh,
- (d) which is set in a block of concrete and projects from 12 to 20 inches above the block.