12.07.2015 Views

SUBCOURSE EDITION - Modern Prepper

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Divide the results by 2:of the grid.60 cm ÷ 2 = 30 cm. This is the measurement for the north and south limitsStep 8: Using the invar scale, set the measurement for the north and south limits of the grid on thebeam compass and mark off the limits on the vertical centerline (fig 2-8). Take your bar beam compassand carefully set the measurement of 30 centimeters on it. Place the pinpoint at the point where thevertical and horizontal centerlines cross, then swing an arc on the vertical centerline above and below thehorizontal centerline.Figure 2-8. Marking off vertical centerline limits.25

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