162 MECHANICS 



62. Drawings. 



In all science work it is very desirable to illustrate 

 the experiments, which you write up, by means of draw- 

 ings. Drawing is like writing, since we use both to 

 express on paper the ideas which we wish to keep in 

 good form, but drawing is often a better means of expres- 

 sion than writing as it sometimes is impossible to write r 

 or even explain by speech, some idea which we have. 

 There are two kinds of drawing; that made without 

 instruments, called freehand drawing, add that made with 

 instruments called mechanical drawing. In science work 

 mechanical drawing is used more than freehand drawing. 



