08.

[Illustration: _Plate IX._]

THE EXPLICATION OF THE TENTH TABLE.

This contains the Plan and Elevation of the Theatre of the _Romans_. AA
is the Portico which went round the Theatre below. BB are the Entries
through which they parted from the Portico's into the _Orchestra_ C.
KDEDK the Pulpitum or Stage; MM the landing-place which separated the
Degrees above from those below: LM the Stairs which are between the
degrees. NN the Portico above in the Theatre. PP the Passage under the
degrees. TT the Stairs by which they mount to the Portico's above. KIHIK
the Scene. H the royal Gate. II the Gates of Strangers. KK the Gates in
returning. OOO the Machines used in changing the Scenes. GG the part of
the Theatre behind.

This Table relates to _p._ 125.

[Illustration: _Plate X._]

THE EXPLICATION Of the ELEVENTH TABLE.

This contains the Explication of the Catapulta, which was a Machine of
War used by the Ancients to dart Javelins of an extraordinary bigness. A
are the two Beams one against the other, and joyn'd, which after having
been drawn, pushed the Javelin with great force when they were unbent.
There is one of these Beams, which is represented as being joyned to the
Capital of the Machine by an Iron Pin, the other ready to be joyned when
the Master of the Machine sounds the Cord with his right Hand, shall
have it heightned or let down, the end marked C, as much as is
necessary, to give it an equal Bent to the other. This is done by the
help of an excentrical piece, which is traversed by a Cylinder, which
the Master turns with a Laver, which he holds in his left Hand. D, E E
is the Capital of the Catapulta. EE are the holes through which the Rope
passeth to draw the Beams. F is the end of one of the Beams represented
in great. G is one of the Pins which travers'd a round Eye, by the help
of which the Beam is joyned to the Capital. H is the Cylinder which
traverses the excentrical piece I. This Plate relates to _pag._ 155.

[Illustration: Plate XI.]

_Explication of the Hardest Terms in_ Architecture.

A

_Abacus_, from [Greek: abax]; which signifies a square
Trencher: In French it's called _Talloir_; it's that
quadrangular Piece commonly accompanied with a
_Cymatium_, and serves instead of a _Drip_ or _Corona_ to
the Capital. It supports the nether _Face_ of the
_Architrave_ and whole _Trabeation_. In the _Corinthian_
and the _Compound_ Orders, its Corners are