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Both the surveyors square and dodecahedron are limited in ancient finds. surveyors square in number of finds, total of two from Roman times and only one survives to the modern day. Dodecahedron is limited in context. over 80 finds total, but no clear definition on its use and conflicting context clues. Controversies of both are discussed.

Finishing the discussion of the ancient Roman dioptera as a surveying tool.

The Reconstruction of a Roman engineering dioptera. Basic use and operation.

Use, construction, and operation of the ancient Roman water level. Functional origin of the spirit level.

Continuation of the discussion of the Chorobates, to use and effectiveness as a surveying tool.

Overview of a recent reconstruction of the Chorobates ancient Roman surveying tool. this example at 1/5 scale length described by Vitruvius. this reconstruction includes separating the different structures that are often incorporated into the Chorobates including the water level.

Part 2 of sequence. A quick update on the groma- the classic Roman surveying tool, also a critique of same, and why other Roman tools were definitely needed and used.

part of a sequence of discussion of ancient Roman surveying tools and methods for a SCA arts and sciences competition, Barony of Dragons Laire Candlemas 2021, An Tir.