does not dry quick enough, u ly corrode* the drawing 



pens. Tin- pen should I*, till. -I i.\ means of a brush or a 

 narrow strip of paper, and n. . > ng the pen into the ink. 



re there are straight line* and arcs 



. straight 

 hiilr th* joint* 

 ?. Camels-hair or sable brnahet aboold be uied ; 



former. The ,1.1 u- MIU--.I down in a dish, and the 



tint should tak.-uh: 



makei U in h.i\ n..- tin- . ..|.,ur ..f too dark 



tin* j-ut to I.. ...;,,!!,! \\ith the brush and 

 efamwaUT for the purpose of damj dry with 



clean -.ike off any s 



take u< isli itii ti,. 



lownwanl > is neceemry to 

 recolour any part let th* first con before begin i 



uieeni have adopted certain colours to represent par- 

 tii ular materials ; these are given in the following table : 



Tab,. Mt.,>ir,Ny Ctk*rt trrW .'. rrj>rftrnt Di/crr*t 



MATI Obcoci 



T Payne's grey or neatral 



Wrought iron . Prunian blue. 



Steel . Purple (mixture of Prussian blue sod crimson lake). 



. Gamboge with a little nienna or s very little red 



Copper A mixture of crimnon lake and gamboge, the 



colour predominating. 

 Lead l.i,-ht Indian ink with a very little indigo * 



. Crimson lake and burnt denna. 

 Firebrick andyke brown. 



Greystooe* i or pule Indian ink. with m little PrassiaB 



.o a.l.led. 

 Brown freestone Mixture of p*U< Indian ink. burnt wmra, and oar* 



r ground work, pale tint of sienna. 

 Hard wood* . For ground work, pale tint of sienna with s little red 



For graining wood* use darker tint with s greater 

 proportion of red. 



