2853 



HYDROGRAPHIC MANUAL 



Page 188 



-Special hook 

 in weighing 



in the structure or around the buoy so that it may be drawn 

 alongside. A Hght grapnel on a light line may be thrown over 

 the chain between the buoy and the relieving barrel for the same 

 purpose. After the buoy is brought alongside, a light line is tied 

 around the top of the mast to guide it while it is being brought 

 aboard. 



A special hook is required on the hoisting line to engage the 

 rope sling on the buoy structure. This type of hook is illustrated 

 in figure 53. An ordinary cargo hook is adapted for this purpose 

 by welding a tube to the back of the shank at the angle illus- 

 trated. The inner diameter of the tube is such that a pin in the 

 end of a long, light-weight pole fits into it loosely. To hook a 

 buoy, the hook on the hoisting line is fitted to the end of the pole 

 by use of the pin and tube and held in place by a strain on the 

 hoisting line. After the hook is engaged in the rope sling the 

 pole is removed and the buoy hoisted. 



2853. Record of Buoys Anchored 



Buoy station names are assigned from a prepared alphabetical list when they are 

 anchored (see 215 and 286). The name assigned to each is recorded on Form 714, 

 Abstract of Buoys Planted, which contains columns for entering all pertinent data. 

 Opposite the station name should be recorded the date when the buoy is anchored ; 

 the depth of water, reduced for tide, in w^hich it is anchored; and its dead-reckoning 

 position. 



Under the heading "Cable" should be recorded: fu'st, the length of chain between 

 the buoy and relieving barrel; second, the length of chain in the main anchor cable; 

 and last, the length of wire rope in the main anchor cable. The scope of the anchor 

 cable may be computed and entered in meters in the column headed "Horizontal 

 Scope" (see 943). Under the heading "Description" a brief description of the buoy 

 structure should be recorded. In the first column headed "Banner," the color, size, 

 and material of the crossed banners are recorded. In the next column headed "Flag," 

 the color of the flags and, if more than one, the order of the colors from top to bottom 

 are recorded. Symbols and abbreviations must be used in these two narrow columns. 

 In the last column headed "Anchor" the total weight of anchor used should be entered. 

 Under "Kemarks" space is provided for any other pertinent information, such as the 

 character of the buoy, if it is other than an ordinary survey buoy. 



The form should be used continuously during the season as buoys are anchored. 

 It is not necessary to use a separate sheet for each date on which buoys are anchored. 

 The separate sheets of the form are bound in a loose-leaf "Buoy Data Book" (see 94), 

 which is kept on the ship's bridge whenever field work is in progress. 



286. Record of Buoy Positions 



When many buoys are anchored and weighed at u-regular intervals by different 

 officers, it is difiicult to keep track of the buoys in position at any time unless a written 

 record is retained . A complete record of the names of the buoys and the dates on which 

 they were anchored and removed is valuable to ensure that some buoy will not be 

 forgotten and left at its position. The record is also used as a basis for reporting 

 to the Washington Office the establishment and removal of buoys for publication in 

 the weekly "Notice to Mariners." (^ee 8524.) 



