The form, octagonal on a square base, was chosen to ease the construction of the formwork.

These stone structures were usually built in circular, square and occasionally octagonal form.

The receiver is modified octagonal form, drilled and slotted for a scope rail.

In his book he advocated the octagonal form since it could be built by the homeowner at a low cost.

It is noted for its distinctive octagonal form.

One characteristic which typifies Jefferson's architecture is the use of the octagon and octagonal forms in his designs.

For gripping purpose the ends of the rod are of octagonal forms.

The buildings at the corner have diagonal baroque façades so that the square gets an almost octagonal form.

The original octagonal form of the mausoleum, encircled by 24 columns, has been almost completely preserved.

It has an octagonal prismatic form and is covered with a conic stone cupola.