People

also

measured

time

using

candle

clocks

and

hourglasses.

As

a

candle

clock

burns,

markings

down

the

side

of

the

candle

measure

the

passing

time.

In

an

hourglass,

sand

falling

from

one

glass

to

another

one

shows

how

much

time

has

gone

by.

An

hourglass

A

candle

clock