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

1. a square block or post of concrete,
2. a concrete cylinder,
3. an irregular mass of concrete.

Note 2.-A standard triangulation-station disk cemented in a drill hole in outcropping bedrock,

1. and surrounded by a triangle chiseled in the rock,
2. and surrounded by a circle chiseled in the rock,
3. 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

1. which is embedded in the ground,
2. which is surrounded by a mass of concrete,
3. which is fastened by means of concrete to the upper end of a long wooden pile driven into the marsh,
4. 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

1. a standard triangulation-station disk,
2. a copper bolt projecting slightly above the concrete,
3. an iron nail with the point projecting above the concrete,
4. a glass bottle with the neck projecting a little above the concrete,
5. an earthenware jug with the mouth projecting a little above the concrete.

Note 8.-In bedrock,

1. a standard triangulation-station disk cemented in a drill hole,
2. a standard triangulation-station disk set in concrete in a depression,
3. a copper bolt set in cement in a drill hole or depression,
4. 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

1. a standard triangulation-station disk cemented in a drill hole,
2. a standard triangulation-station disk set in concrete in a depression,
3. a copper bolt set with cement in a drill hole or depression,
4. 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

1. a bottle in an upright position,
2. an earthenware jug in an upright position,
3. 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

1. a square block or post of concrete,
2. a concrete cylinder,
3. an irregular mass of concrete.

Note 12.-A standard reference-mark disk, with the arrow pointing toward the station,

1. cemented in a drill hole in outcropping bedrock,
2. set in concrete in a depression in outcropping bedrock,
3. cemented in a drill hole in a boulder,
4. 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

1. which is embedded in the ground,
2. which is surrounded by a mass of concrete,
3. which is fastened by means of concrete to the upper end of a long wooden pile driven into the marsh,
4. which is set 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

1. a square block or post of concrete,
2. a concrete cylinder,
3. an irregular mass of concrete.

Note 17.-A standard azimuth-mark disk, with the arrow pointing toward the station,

1. cemented in a drill hole in outcropping bedrock,
2. set in concrete in a depression in outcropping bedrock,
3. cemented in a drill hole in a boulder,
4. 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

1. which is embedded in the ground,
2. which is surrounded by a mass of concrete,
3. which is fastened by means of concrete to the upper end of a long wooden pile driven into the marsh,
4. which is set in a block of concrete and projects from 12 to 20 inches above the block.