Excerpt from The Topography of Rome and Its Vicinity
Where the details were not investigated the Map has been left blank.
The triangulation was constructed by means of a small sextant, made by Berge, the successor of Ramsden. The base, of more than eight miles, which Boscowich and Le Maire had measured from the tomb of C?cilia Metella to a column near Frattocchie, served for the scale.
Soon after the Map had been completed, Signore Calandrelli, and others employed by the Pontifical Government, having measured another base, and employed larger and more perfect instruments, published in numbers a few of the results of their observations. These were found to agree very satisfactorily with the details of our Map, with the exception of the position of Fiumicino, which has since been changed in consequence of their observations.
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