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Of the rivers of Fars only three important ones flow into the sea: (1) the Mand (Arrian's Sitakos), Karaagha.ch in its upper course; (2) the Shapur or Khisht river (Granis); (3) the Tab (Oroatis).
The deduction of the formula tab, where a and b are numbers, should be regarded as a later step.
The popular pronunciation to and tau for tab has given rise to the spellings Toris and Tauris met with in older travellers and used even now.
Readers of Dante know the idea that the dead have no shadows; this was no invention of the poet's but a piece of traditionary lore; at the present day among the Basutos it is held that a man walking by the brink of a river may lose his life if his shadow falls on the water, for a crocodile may seize it and draw him in; in Tasmania, North and South America and classical Europe is found the conception that the soul - o-tab., umbra - is somehow identical with the shadow of a man.
4) at which the surface of contact OP meets the solid is denoted by a, Tbc - T ca - Tab cos a = o, Whence cos a = (Tbc - Tca)/Tab.