1878.] io the BeproJiLction of Maps and Plana. 63 



show the shaded parts by a light tint of blue, violet, or aniline red 

 (fuschine or roseine). These parts will reproduce white, and can have a 

 ruled tint transferred on the stone or zinc in the usual way, which will give 

 a much neater appearance. 



5. In plans or drawings intended for photozincography, ivashes of 

 any colour except very pale blue, violet, or aniline red, are absolutely in- 

 admissible. Outlines, may, however, be drawn, if necessary, in any strong 

 red, brown, yellow, orange or green pigment which will reproduce black. 

 Any details required to be shown in the original, but not in the copy, may 

 be drawn in pale blue, violet, or aniline red. Details that are not required 

 to be reproduced may be painted out with Chinese white. 



6. Kiver courses, lakes and tanks should be left blank, and not filled 

 in with fine lines. They may be indicated by a pale wash of blue without 

 detriment to their reproduction. 



7. When drawings are to be reduced care must be taken to draw the 

 lines, lettering, and detail of sufficient thickness and size relatively to the 

 scale of reduction, so that they may not be lost or illegible when reduced. 

 Sufficient space must also be left between the lines to prevent subsequent 

 blocking up. 



8. When possible, drawings should be made on a larger scale than 

 they are required to be copied. Photographic reductions are always sharp- 

 er and firmer than reproductions to the same scale, and defects in drawing 

 are lessened by reduction. 



9. Where plans or drawings to scale are to be reduced, the scale should 

 be given in terms of a single unit of measurement and not as relative to any 

 second unit. Thus, the scale on a map drawn on the scale of 4 miles to 

 an inch for reduction to 16 miles to an inch, should be shown simply as a 

 '' scale of miles." 



10. As photography produces a more or less perfect facsimile of the 

 original drawing, it is essential that drawings intended for publication 

 should be complete and finished in every respect before they are made over 

 to the photographer. The drawing, printing of names, &c., should be in as 

 neat a style as possible, and not require to be altered or touched up. The 

 hair-strokes of the printing should not be too fine. 



The foregoing rules may be summed up in a few words : — White-paper, 

 BLACK- INK, and FiEM OPEN DRAWING ; and as success in the after processes 

 depends entirely upon the perfection of the original drawing and its capa- 

 bility of giving a negative on which the ground is perfectly ojmque while 

 the lines are quite clear and as transparent as the bare glass, these essentials 

 must be most carefully observed. Their neglect will entail failure and 

 disappointment. 



For drawings intended for reproduction by the collotyj)e methods these 



