First lessons in wood-working . 158 Manual Training, the drawing as in the figure. The drawingof the three lines, or axes P Q, P R.and P S is easily accomplished, as in Fig. 74.. J^7>^ 73, Q Draw a circle with an}^ radius. From thehighest point on the circumference lay offthe radius six times, and through the alternatepoints draw the three axes. To secure accuracythe radius should be taken at least as longas the longest line in the drawing. It will be well, now, to make a few iso-metric drawings of simple objects, such as thebox of Lesson XX., the through mortise ofLesson XV, and the end do
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First lessons in wood-working . 158 Manual Training, the drawing as in the figure. The drawingof the three lines, or axes P Q, P R.and P S is easily accomplished, as in Fig. 74.. J^7>^ 73, Q Draw a circle with an}^ radius. From thehighest point on the circumference lay offthe radius six times, and through the alternatepoints draw the three axes. To secure accuracythe radius should be taken at least as longas the longest line in the drawing. It will be well, now, to make a few iso-metric drawings of simple objects, such as thebox of Lesson XX., the through mortise ofLesson XV, and the end dove-tail of LessonXVL, to accustom the eye to the reading of Wood - Working. 159 such drawings. It will be readily seen bythose who understand ordinary perspectivedrawings, thatisometric draw-ings differ fromthese only ingiving the truedimensions of theremote as wellas of those ofthe near parts, while perspectivedrawings makethe parts thatare farther awayappear smaller, and therefore a scale cannotbe applied to them.