The portable sundial of Parmenion

The portable sundial of ParmenionThree articulated rings hung at vertical position with the external ring oriented East West. The central ring consisted of two semicircles, bearing 2 pairs of engravings of 7 grooves defining the months (zodiacs) for 4 different latitudes towns). The inner ring bore a hole on its periphery, while around it there were engravings dividing it into 12 equal parts which defined the 12 hours. During the clock operation, the semicircle with the data of the

It was played by two players on a shaded surface that was constituted of three concentric squares linked with the midpoints of their sides

black and white pebbles

) and they were trying to put them alternately in order to form a straight line or prevent the opponent from accomplishing this

thus a bright spot indicated the hour on the opposite side

During the clock operation

the square or (like tangram) some particular figures (e

based on the acrophonic (Herodian) numeral system (e

Δ to represent Δέκα (ten)

while around it there were engravings dividing it into 12 equal parts which defined the 12 hours

Thus it was created at the section points of the lines nine positions for the pawns

It was a disc with 24 holes (one for each letter of the alphabet) on the periphery

Arithmetic operations were carried out by the combined movement of the pebbles