CHAP. I.] MOUNTING PAPER 45 



Columbier 



Atlas 



Double Elephant 



Antiquarian 



Emperor 



35 inches by 23 J 

 34 „ „ 26" 

 40 „ „ 27 

 53 „ „ 31 



68 „ „ 48 



Atlas, Double Elephant, and Antiquarian are most used in 

 chart-making, and are the sizes supplied by the Hydrographic 

 Office. 



For all rough work, as sounding sheets, ordinary field work, 

 etc., drawing-cartridge is used. It is quite good enough, and 

 does not entail such expense as the use of an indefinite quantity 

 of hot-pressed drawing-paper. 



Tliis cartridge-paper is mounted on the drawing-boards by Field 

 being wetted, and rubbed on to the well-pasted board in the ^o^r**^' 

 manner described above for mounting on holland. It will 

 dry quite flat. When this paper is done with, it must be 

 floated off the board, which will cause it to distort and con- 

 tract considerably by the time it again dries ; but as all the 

 work on it will have been beforehand transferred to the tracing, 

 this does not so much matter. The paper must be kept, 

 however, as a record, for which it is just as valuable. 



Where a field board is wanted for delicate coast-line or 

 other intricate work, a sheet of Atlas can be mounted, or 

 white Bristol board used. The latter has many advantages, 

 and can be tacked on to a board to keep it flat. If chart 

 pins are used with thick Bristol board, they mil not hold 

 for long, and will give much bother by constantly falHng out. 



The Atlas paper, being good, may be mounted on to the 

 board by merely pasting the edges, as described above. It 

 can then be cut off without much distortion. If cartridge 

 is treated this way, it is very apt to tear, being of a loose 

 texture. 



BOOKS. 



Blank books of various forms and dimensions for boat work, 

 field work, etc., are supplied from the Admiralty. These for 

 the most part require no forms ruled in them ; but there are 

 a few purposes for which it is very convenient to have ruled 

 forms bound up. 



