scales were used in the figure, and parallels were drawn from the section lines. 



ss were used in the hgure, and parallels were drawn from the section lines. 

 The isometric projection is referred to as a 20- or 30-degree projection, 

 ^.v^jnding on the perspective effect desired and the construction necessary to 

 produce this effect. An isometric projection is always less than 45 degrees; 



Figure 24-51. A — Log map. 5— Panel map. 



513 



