Heron Alexandrinus
,
Mechanica
,
1999
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21
The
nut
now
is
manufactured
in
the
following
way
.
One
takes
a
hard
piece
of
wood
(bc),
whose
length
is
twice
as
great
as
the
nut
and
whose
thickness
is
equal
to
it
.
On
the
one
side
we
make
a
screw
(
d
,
d
)
on
half
of
the
[
piece
of
]
wood
,
according
to
the
description
given
earlier
.
Let
the
depth
of
its
threads
be
as
great
as
that
of
the
threads
on
the
screw
that
we
want
to
screw
into
the
nut
.
On
the
other
side
we
remove
by
turning
the
amount
of
the
thickness
of
the
screw
grooves
,
so
that
the
[
piece
of
]
wood
becomes
like
an
evenly
thick
peg
(
e
,
e
).
Then
we
draw
the
diameter
of
the
base
of
the
[
piece
of
]
wood
and
divide
it
into
three
equal
parts
.
In
one
of
the
two
dividing
points
we
erect
a
perpendicular
on
the
diameter
.
Then
we
draw
from
the
end
(
points
)
of
this
line
that
is
perpendicular
to
the
diameter
,
on
the
entire
length
of
the
peg
,
two
straight
lines
(ty, uz).
We
achieve
this
by
putting
the
peg
on
a
straight
board
and
furrowing
it
with
pliers
,
until
we
reach
the
thread
.
Then
we
carefully
use
a
fine
saw
and
saw
it
through
to
the
thread
.
Then
we
detach
the
marked
third
(utzy)
from
the
peg
and
carve
into
the
center
of
the
two
remaining
parts
a
canal-like
groove
(fghi)
on
the
entire
length
,
half
as
deep
as
the
remaining
thickness
.
Then
we
take
an
iron
rod
(lknm)
and
turn
it
according
to
the
screw
threads
.
Hereupon
we
attach
it
to
the
peg
(ee),
in
which
is
the
groove
,
and
let
its
(
blunt
)
end
approach
the
thread
(
of
wood
ending
in
u
),
after
having
firmly
connected
the
two
pieces
(
the
sawed
off
one
and
the
hollowed
one
),
so
that
one
adheres
to
the
other
and
there
remains
absolutely
no
space
between
them
.
Then
we
take
a
small
wedge
(opqrvw),
insert
it
into
the
canal-like
groove
and
hit
it
,
until
it
drives
out
the
iron
rod
and
falls
between
the
two
parts
.
Having
done
this
,
we
insert
the
screw
into
a
drilled
[
piece
of
]
wood
(<
z
>, <
z
>),
in
which
is
a
completely
straight
hole
measuring
the
same
as
the
thickness
of
the
screw
(dd).
Then
we
drill
into
the
walls
of
this
wide
hole
small
holes
,
placed
side
by
side
,
insert
into
them
small
,
oblique
plugs
(<
h
>)
and
let
these
penetrate
so
far
until
they
mesh
with
the
thread
of
the
screw
.*)
Then
we
take
the
[
piece
of
]
wood
(
T
),
into
which
we
want
to
drill
the
nut
thread
,
drill
a
hole
(<ee>)
corresponding
to
the
screw
peg
(ee)
into
it
and
connect
this
[
piece
of
]
wood
with
the
one
into
which
we
have
inserted
the
screw
,
by
two
posts
that
we
fasten
completely
.
Then
we
insert
the
peg
(<
g
>),
in
which
is
the
wedge
,
into
the
hole
(<ee>),
which
is
in
the
[
piece
of
]
wood
(
T
)
that
is
to
be
drilled
to
[
form
]
a
nut
thread
,
drill
into
the
upper
end
(<
b
>)
of
the
screw
holes
,
into
which
we
insert
spokes
,
and
turn
it
,
until
it
(
the
peg
<
g
>)
penetrates
into
the
wood
.
We
do
not
stop
turning
it
up
and
down
and
driving
the
wedge
again
and
again
,**)
until
the
nut
thread
is
drilled
as
we
intended
.
Then
we
have
drilled
the
nut
threads
.
and
this
is
the
shape
,
and
with
its
completion
the
book
is
completed
(TB)
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