The sun shining, he fixed a round glass speculum (orbem e vitro) in a window-shutter, and then closing it the images of outside objects would be seen transmitted through the aperture on to the opposite wall, or better, a white paper screen suitably placed.
The account is not very clear, but seems to imply the use of a concave mirror rather than a lens, which might be suggested by the word orbem.
Cities and kingdoms were allotted to their several patronage on a system fully expounded by Manilius: Hos erit in fines orbis pontusque notandus, Quem Deus in partes per singula dividit astra, Ac sua cuique dedit tutelae regna per orbem, Et proprias gentes atque urbes addidit altas, In quibus exercent praestantia sidera vires.s Syria was assigned to Aries, and Syrian coins frequently bear the effigy of a ram; Scythia and Arabia fell to Taurus, India to Gemini.
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