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The following examples relative to stamping triangulation-station and reference- 

 mark disks shall be strictly followed: 



CASE I. — A new station is established. In the center of the station-mark disk is a small triangle. 

 The year of establishment is stamped under one side and the name above the opposite apex of the 

 triangle. 



Two reference marks shall be established and the disks shall be stamped with the station name, 

 number, and year. The reference marks shall be numbered consecutively in a clockwise direction 

 from true north. They must be set so that the arrows on the disks point toward the station mark. 



Special disks, used for azimuth marks only, can be obtained from the Washington Office by requi- 

 sition. These azimuth disks shall be stamped with the name of the station and the year of establish- 

 ment. 



Example. Station EAGLE is established in 1940. The disks shall be stamped as follows: 



Station mark: EAGLE, 1940 

 Reference marks: EAGLE No. 1 (or 2), 1940 

 Azimuth mark: EAGLE, 1940 



CASE II. — The station mark, reference mark, or azimuth mark is reinforced but not re-marked 

 or otherwise disturbed in any way. If any or all of the above marks are reinforced only, the original 

 stamping on the disks shall be retained without change, alteration, or addition. 



CASE III. — The station is re-marked in the precise original location, and a new reference mark is 

 established. The original name and date of the station shall be retained and, in addition, the year 

 the station is re-marked shall be stamped under the date of original establishment. In re-marking 

 the station, a new station-mark disk shall be set if none was used formerly, or if the original disk 

 cannot be re-used. 



If the two original reference marks are in good condition and in no danger of being destroyed in 

 the near future, they should not be altered. 



Example. — Station "TABLE, 1925" is re-marked in 1940 and one new reference mark established. 



The station-mark disk shall be stamped "TABLE, 1925-1940." 



The new reference-mark disk shall be stamped "TABLE, No. 3 (or next unused consecutive number), 1925-1940." 



CASE IV. — The station mark only is moved. 



If a station is to be moved, it is generally more practicable to establish a new mark in the new loca- 

 tion, and when this is done the old mark must be completely destroyed. The station name shall be 

 preserved but the number "2" shall be stamped after the name (see 2156). The year the station is 

 moved shall be stamped on the station-mark disk. The date of establishment of the original station 

 shall not be stamped on a new disk, and if the old mark and disk are re-used, the original date shall 

 be effaced by light tapping with the rounded end of a ball-peen hammer and the disk re-stamped with 

 the new year. 



At least one new reference mark shall be established, stamped with the new station name and year 

 of moving the station and given the next unused consecutive reference-mark number. The stamping on 

 the previous reference-mark disks shall not be changed. 



Example.— The station mark for "LUTKE, 1925" is moved in 1940 but the reference marks are not moved. 

 The disk in the moved mark shall be stamped "LUTKE 2, 1940." If there were two previous reference marks, the new reference 

 mark shall be stamped "LUTKE 2, No. 3, 1940." 



CASE V. — The station mark and one or more of the reference marks or the azimuth mark are 

 moved. 



The station mark shall be treated as in CASE IV. The newly established reference-mark disks 

 shall be stamped with the name of the station, the following consecutive numbers, and the year the 

 station was moved. The old date of establishment should not appear on the disks of any of the moved 

 marks. Should it be more practicable to reset one of the moved reference marks rather than establish 

 a new one, the stamping on the disk which is no longer in order shall be effaced as in CASE IV and 

 the correct notation re-stamped. The former reference marks which have been moved or destroyed 

 shall be reported as nonexistent. 



i;xa7np/e.— Station "SITKA, 1925" and its reference mark No. 2 are moved in 1940. 



The station-mark disk shall be stamped "SITKA 2, 1940." Reference mark No. 1 shall not be re-stamped. Reference mark 

 No. 2, having been reset in a new location, shall be re-stamped "SITKA 2, No. 3 (or the next unused consecutive number), 1940." 

 Should reference mark No. 2 be destroyed and a new reference mark set, the stamping on the new disk shall be exactly the same as in the 

 preceding sentence. If the azimuth mark is moved it is stamped "SITKA 2, 1940." It is not re-stamped unless it is moved. 



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