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Whenever the dimensions of the column were sufficiently great the stone beams which met upon the die or **abacus** had oblique joints.

This, as pictured in the text, is the common Gerbert **abacus**.

Now look under the **abacus** of this capital; you will find the stone hollowed out wonderfully; and also in this arch-mould.

The **abacus** has a width equivalent to the thickness of the bottom of a column.

The more slender the shaft, the greater, proportionally, may be the projection of the **abacus**.

The **abacus** is the crowning member of the capital, as the capital is of the column.

We worked, not with slate and pencil, but with a rectangular wooden frame set with beads, resembling an **abacus**.

Though the month was February below it was May in the **abacus** of the column.

Arithmetic is holding the tables of the **abacus**, and below her is sitting Abraham, its inventor.

Norman **abacus** blended with Early English foliage in capitals.

abacus late 14c., "sand table for drawing, calculating, etc.," from L. abacus, from Gk. abax (gen. abakos) "counting table," from Heb. abaq "dust," from root a-b-q "to fly off." Originally a drawing board covered with dust or sand that could be written on to do mathematical equations. Specific reference to a counting frame is 17c. or later.

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