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| Corpus Agrimensorum | ||||
| Another of my to-dos is a page describing the romans two primary surveying instruments, the groma and the libra. The groma was the instrument used by the Romans to lay out roads. While the groma was restricted to laying out horizontal dimensions, the libra complemented it with the measurement of vertical angles. Without this instrument, the famous Roman aqueducts, such as the Pont du Gard, would of been impossible to build. I hope to be able to include some detailed drawings showing their possible contruction, to the end of being able to fabricate usable instruments. There exist many references, but unforunately details of the actual construction and dimensions of both the groma and the libra are scarce. Some guessing may be necessary. Here are the first set of my drawings for the groma. Other than the gross dimensions of the width and height, the dimensions that I've used are guesses. And more to the point, I have yet to attempt to build a groma based upon these drawings. This is all very preliminary. |
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