Johnson-level-tool-mfg RAS-1 Manuel d'utilisateur télécharger pdf (Page 34)

Now, draw the bottom plumb line using your inch rise on

thecommonscaleofthesquare,exactlyasyoudidfor

thecommonrafter(seeFigures18and19).Ifyouwishto

conserve wood, adjust the bottom plumb line so that its

lengthisequaltothesteprise.Nextdrawthebottomoor

line by measuring down the bottom plumb line the dis-

tanceofthestepriseminusthetreadthickness.Inourex-

ample,witha1"tread;7.29"minus1.00"givingyou6.29",

or65/16".Usethesquarethesamewayasyoudidforthe

bird’smouthhorizontalseatmark(See7A&7Band19).

FIG. 19 Step Layout.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 66 67

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Johnson-level-tool-mfg RAS-1 Manuel d'utilisateur Page 34