PREPARATION OF THE DESIGN 93 



small detail work owing to their transparency, 

 but large celluloid set squares are inclined to warp 

 and become spoilt. Vulcanite is a strong material 

 and lies flat on the paper, but has a drawback in 

 that one cannot see whether it is clean or not. 



French curves are made of thin pear-wood, 

 and are for ruling in curved lines, not for setting 

 them out which should be done first by hand. 

 Such portion of the curve as exactly fits is set 

 against the drawing, and ruled in, and the curve 

 is shifted until another part fits, and that is used. 

 To join these portions is difficult, but if the 

 draughtsman refrains from using the whole of 

 the curve that seems available he will find the 

 parts run together more readily. The wooden 

 curve should overlap the previous portion to make 

 a good blend. Curves can of course be inked in 

 freehand, but the handmade line has a different 

 character and it does not look well with ruled 

 lines. 



The pen is best filled with a quill which is sup- 

 plied fixed in the cork of some brands of drawing 

 ink. It should never be dipped. A good pen is 

 a treasure and should be treated as such. 



Another useful form of pen is the ''road pen " 

 which consists of two in one handle. A screw 

 enables one to set the pens at the distance required 

 and for taking parallel lines round a curve it 

 saves time. 



Pencils must be good. H.B.'s are good for 



