Each brick was made in a wooden frame or mould.

Most of the baked bricks were inscribed, not however like the Chaldaean, the Egyptian, and the Babylonian, with an inscription in a small square or oval depression near the centre of one of the broad faces, but with one which either covered the whole of one such face, or else ran along the edge.

It is uncertain whether the inscription was stamped upon the bricks by a single impression, or whether it was inscribed by the potter with a triangular style.

Mr.
Birch thinks the former was the means used, "as the trouble of writing upon each brick would have been endless." Mr.Layard, however, is of a different opinion.
In speaking of the Assyrian writing, some mention has been made of the terra cotta cylinders and tablets, which in Assyria replaced the parchment and papyrus of other nations, being the most ordinary writing material in use through the country.

The purity and fineness of the material thus employed is very remarkable, as well as its strength, of which advantage was taken to make the cylinders hollow, and thus at once to render them cheaper and more portable.