De architectura libri decem

Conspectus siglorum Vitruvii

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Ις

=   1/16

Γ

=   3/16

÷

=   4/16 = 1/4

δ

=   4/16 = 1/4

9

=   4/16 = 1/4

ε,Ε

=   5/16

ς,F

=   6/16

ζ,Ζ

=   7/16

S

=   8/16

Γς

=   9/16

ΓΖ

=   10/16 = 5/8

S÷

=   12/16 = 3/4

:·:

=   5/12

FΖ

=   10" (?)