The stucco of the internal wall is decorated with bold and very effective patterns - birds and scroll-work and other decorative designs.
One example of rich and costly decoration remains - part of a frieze of white alabaster, sculptured in relief with rosettes and interlacing patterns, and studded with jewel-like pieces of blue glass or enamel, the Opcyu xviwow of Od.
Many examples survive, some of them large and luxurious country-houses, some mere farms, constructed usually on one of the two patterns described in the account of Silchester above.
The urns themselves are of clay, somewhat badly baked, and bear geometrical patterns applied with a punch.
Hence in more recent patterns of magnetometer it is usual to do away with the transit mirror method of observing and either to use a separate theodolite to observe the azimuth of some distant object, which will then act as a fixed mark when making the declination observations, or to attach to the magnetometer an altitude telescope and circle for use when determining the geographical meridian.