Around

3000

BC,

the

Egyptians

made

weights

from

different-sized

stones.

They

hung

pans

on

the

stick

scale

and

placed

the

stones

in

one

pan.

In

the

other

pan

they

placed

the

object

they

wanted

to

weigh.

They

measured

the

weight

of

the

object

by

how

many

stones

were

needed

to

balance

the

scale.

Later,

these

stone

weights

were

standardised.

This

meant

that

everyone

used

weights

of

the

same

size

and

density.

Food,

money,

metals

and

medicine

were

measured

using

stone

weights.

An

old-fashioned

scale

with

a

collection

of

standardised

weights.