Fig. 241.
Dimensioning Drawings.
To “dimension” working drawings is to place measurements upon the parts represented, to enable the workman to proceed without measuring the drawing itself.
These dimensions should be placed so as not to interfere with nor crowd the lines of the drawing, nor yet interfere with one another.
Arrow-heads are used at the extreme points of measurement, the figures are generally inserted midway between the arrows; a dot and dash line reaches from the figure to the arrow-heads, as shown below.
When the dimension is short these lines are omitted and the dimension is placed outside the drawing, thus
and connected by a curved line; at other times it is found needful to place arrow-heads outside the drawing and the measurement inside.