The Method of Drawing the Elevation and Section from the Plan, 
is as follows. 
The Plan being drawn, and its measures ascertained, a vertical line must be 
drawn parallel to the end of it, and the measures transferred from the plan to it; 
then the line of the back wall is produced beyond it, and the leg of the compass 
being placed in their intersection, all the measures are again successively transferred 
to this last, (as shewn m 1 lan of the first Plate,) and the internal disposition of the 
section determined, by drawing uplines from it, (the heights of the different parts 
supposed known). Horizontal lines drawn from the section determine the height 
of the elevation and section, on the back wall ; and the place of the arches in front 
is found, by drawing up lines from the front of the Plan. With a very superficial 
knowledge of drawing, accurate sections, and elevations of these and other build¬ 
ings, may be readily made by this method. 
One thing it is necessary to premise, which may be looked upon as an axiom in 
constructing those buildings; that the less air they contain, or the lower they are, 
(consistently with the size of the plants they are intended to receive,) with so much 
the greater effect can they be worked, and with so much the less expence can they 
be supported. Hence the reason that Pine Pits, are at present in such estimation. 
