Global Positioning System Reference
In-Depth Information
(a)
(b)
(c)
FIGURE 3.4.
Roman aqueducts through the ages. (a) A 1786 painting of the Pont du
Gard aqueduct, in France. (b) An old print of the Segovia aqueduct in Spain. (c) A
recent photo of the Valens aqueduct in Istanbul. All three structures still exist.
(a)
Le Pont du Gard
, by Hubert Robert; (b)
Encyclopedia Britannica,
1911 ed.; (c) Wikipedia photo
by Necdet Cevahir.
