The construction of the wonderful canon of logarithms

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I04
Preliminary.
ment are added particulars of the Logarithmic tables computed by
Ursinus, Kepler, and Briggs, with a note of some other works of
interest.
Collation.
The arrangement of the title-page in the original is indicated by
placing an upright bar to mark the end of each line.
The symbols 4°, 8°, 12°, etc., indicate the number of leaves into
which the sheet of paper was folded ; but the number of leaves made up
in the signatures sometimes differs from this : thus, for example, in the
early editions of A Plaine Discovery, though the sheet is folded into 4
there are 8 leaves to each signature.
The measurement of the largest copy examined has been given, but
in many cases the work in its original state must have been considerably
larger, the copy having been cut down in rebinding.
The signatures in the editions described consist of