Paravia.
[72] I take these figures from the plan of Paravia, which is said to be the most correct plan of Turin at present available.

Promis gives smaller dimensions, 720 x 670 m., and he measured from what is now known to be a point too far to the east (the Via Accademia delle Scienze) instead of from the west front of the Palazzo Madama; he has, however, been usually followed.

Other maps give other dimensions, Orlandini (1844), 758 x 780 m.; Vallardi (1869), 680 x 740 m.; Maggi (1876), 730 x 800 m.; Ashby (Art.
'Turin' in _Encycl.

Britannica_) gives 2,526 x 2,330 ft.

which must be too large.