bulldozer
A tractor or other prime mover equipped with a blade attached by arms or brackets to its front end; used in pushing […]
Glossary
Built-up roof
A roofing composed of three to five layers of asphalt felt laminated with coal tar, pitch, orasphalt. The top is
Glossary
built-up roofing, composition roofing, feltand- gravel roofing, gravel roofing
A continuous roof covering made up of laminations or plies of saturated or coated roofing felts, alternated with layers of asphalt or coal-tar
Glossary
built-up beam
1. A beam made of structural metal units (such as plates and angles) which are riveted, bolted, or welded together. 2. A
Glossary
building trap, main trap
A running trap on the outlet side of a building drain (on the sewer side of all drain connections); prevents the passage of
Glossary
bucranium, bucrane
A sculptured ornament representing the head or skull of an ox, often garlanded; frequently used on Roman Ionic and Corinthian friezes.