iii like manner from the cake of Prussian Muc. 



."MnutVm linrx hnuM i- p,,t m 



or ra/ !, depending on which colour was us*d for the 



met and* an* best ptr 



-at colour. The arrow -luiuls at the rm\ 



IIM..II lines are now put in ith U.t.-k ink, and so are the 

 figures for the dimensions. The arrow-heads and the figure* 

 should be made with a common Hinrniwmf 

 should IN- put on nriti a good drawing has iU appear- 

 ance spoilt < I t)>n>ugh being slovenly dimensioned. 



may here p the importance of putting the 



nsions on a working drawing drawing is not 

 iniiensioned, the workman must get his sixes from the drawing 

 by applying his rule or a suitable scale. Now this operation 

 takes time, and is very liable to result in error. Time is 

 therefore saved, and the chance of error reduced, by marking 



tin- ibM in ti.'ur- I 



In practice it is not usual to send original drawings from 



i rawing office to the work shop, but copies only. The copies 

 may be produced by various ' processes,' or they may be trac- 

 ings druuii I'Y hand. Many rniginenn do not ink in U 

 original drawings, but leave them in pencil ; especially is this 

 the case if the drawings are not likely to be much used. 



Scale*. The best scales are made of ivory, and a: 



iiea long. Boxwood scales are much cheaper, although 



so durable as those made of ivory. If the studt* nt does 

 not care to go to the expense of ivory or boxwood scales, he 

 can get paper ones very cheap, which * ill l quite sufficient 



his purpose. he scale should be marked 



down to it&edge, so that measurements may be made by aj 



the scale directly to the drawing. For working such 

 exercises as an in this U-.k the student should be provided 

 he following scales : 



A scale of -h to a foot, 



I - 

 i - * 



- * 



