Figure 3-1.-Blueprint Title blocks: (A) Naval Ship Systems Command; (B) Naval Facilities Engineering Command.
the drawing and dash number and carry a leader line to
the part; others use a circle, 3/8 inch in diameter around
Reference numbers that appear in the litle block
the dash number and carry a leader line to the point.
refer to the number of other blueprints. When more than
A dash and number are used to identify modified or
one detail is shown on a drawing, a dash and a number
improved parts and to identify right-hand and left-hand
are frequently used. For example, if two parts are shown
parts. Many parts on the right side of a piece of
in one detail drawing, both prints would have the same
equipment are identical to the parts on the left sidein
drawing number, plus a dash and an individual number,
reverse. The left-hand part is usually shown in the
such as 8117041-1 and 8117041-2.
In addition to appearing in the Title block, the dash
Above the Title block on some prints, you may see
and number may appear on the face of the drawings near
the parts they identify. Some commercial prints show
a notation such as 159674 LH shown; 159674-1 RH