To make these as shown in fig. 16, proceed as follows: With the word
_one_ make a point, with _two_ another point six inches at the left,
with _three_ draw a straight line from the left point to the right. All
added lines should be parallel: for practice, reverse the process thus,
_one_, make a “point,” at _two_ another point at the right, at _three_
draw line to the left.
The student will note that the two motions--at the words _one_ and
_two_--are to fix the positions of the ends of the lines; this practice
will be found useful in the most advanced examples and an item of
elementary practice never to be forgotten--like the help to be derived
by the first round of a ladder.
[Illustration: Fig. 17.]
[Illustration: Fig. 18.]