The profitable Rodde or Staffe 1556

digges-cross-staff-1556_1kYe shall prepare two small straight, stiffe, round or rather square rods of mettall or of wood, well plained of like bigness and length. Although it make no matter what length, yet to avoid the errores which little instruments and those staves bring, and also to beare with the rude unwonted handling of such Artificers: Let our Rods bee each five or at the least three foote and every foote divided into 12 even parts of inches as yee see at (b) and (c) (d). These rods must be forged with a boyce (hinge or socket joint)  in the end of them to iopne (open) readily tenne or five foot in length (when time requireth) as the figure (e) (f) showeth. Also yeee must get (by the helpe of some Craftsman) foure other like Rods the longer (g) 2 foote: the next (h) 1 foote: the other (i) 6 inches, then (k) 3 inches, the last and shortest (l) 1 inch, and 1/2. Each of these must have in their middell a hole, that the long staff of ten foote may bee put through them, and they moved on him at pleasure up and downe always cutting the longer staffe (e)(f) Squarewise and be made to tarry on any position …

From Leonard Digge’s  ‘A Book Named Tectonicon’ 1556.

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