Marcius Philippus. These two dials
were fixed on pillars behind the Rostra in the Forum, the most
convenient place for regulating public business, and there they
remained even in the time of Cicero[409]. But in the censorship next
following that of Philippus the first water-clock was introduced; this
indicated the hours both of day and night, and enabled every one to
mark the exact time even on cloudy days[410].
Thus from the time of the Punic wars the city population reckoned time
by hours, i.e. twelve divisions of the day; but as they continued to
reckon the day from sunrise to sunset on the principle of the old
agricultural practice, these twelve hours varied in length at
different times of the year. In mid-winter the hours were only about
forty-four minutes in length, while at mid-summer they were about
seventy-five, and they corresponded with ours only at the two
equinoxes.[411] This, of course, made the construction of accurate
dials and water-clocks a matter of considerable difficulty. It is not
necessary here to explain how the difficulties were overcome; the
reader may be referred to the article "Horologium" in the _Dictionary
of Antiquities_, and especially to the cuts there given of the dial
found at Tusculum in 1761.
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