aventurine
Glass (or glazes) containing colored spangles of nonglassy material.
A water supply system whose operation is not dependent on any manual setting of any items of equipment, such as
A sprinkler system in which all piping and sprinkler heads, at all times, are filled with water under pressure; the
An energy source (other than the sun), used to supplement or provide backup for the output provided by a solar
The additional heat which is supplied by a conventional heating system in a house when its solar energy system fails
All dynamic loads other than the basic design loads which a building must sustain.