CHAPTER XVII 



THE COMPLETED CHART 



Fair Chart — Reducing Plans — Delineation — Symbols — Colouring — 

 Graduation. 



The work is sent home to be published in several ways, accord- Trans- 



, . , mission 



ing to circumstances. Home. 



When the detail, as it proceeds, is inked on the original sheet 

 itself, it may be necessary to transmit a portion home before 

 the survey is all complete, and a tracing is often used for this 

 purpose, as the original sheet, with the " points " still accumu- 

 lating, must be retained on board ; but, if possible, it is better 

 to send work home on drawing-paper, which is not liable to so 

 many accidents from tearing, etc., can be more fully worked 

 up as regards detail, and can be better kept as a record, though 

 the originals will in the end be transmitted to the Admiralty 

 in any case. 



When the detail is placed directly on the original sheet, it is Original 

 very difficult to keep it clean enough for everything to be clear 

 and distinct, as straight-edges, protractors, etc., will be con- 

 stantly placed on the chart over the completed part, and lines 

 must be often drawn over it. It caji be kept clean enough for 

 transmission home as a finished chart, and by doing so, all 

 errors arising from imperfect transferring will be avoided ; but 

 the surface of the paper must get so rubbed by constant clean- 

 ings, that, if a large sheet, it is seldom satisfactory. Several 

 hands may have been employed in it, and the chart will then 

 bear a piecemeal look. If this original sheet is not sent home, 

 a copy has to be made on another sheet of paper, which will be 

 the fair chart. 



The usual mode of making this is to place the new sheet ^^•i' 

 under the old one, and prick the " points " through the latter, 



373 



