English (language) A castle is a fortress. It may also have a residence, and many castles were residences of various lords and nobles, but a castle isn't required to be a residence, as many were built to be forts guarding militarily interesting areas. A mansion is a large, opulent residence. It may have a fairly high degree of security and some level of fortification to protect the people living there, but it is not intended to be a strong place with strategic military importance. Written Jun 12, 2015 â¢ View Upvotes.
A plug weld is used to fasten two pieces of metal together using a welder. When joining the pieces, a hole is drilled into the top piece and it is laid over the bottom one. A weld is then made by running a bead inside of the drilled hole, thereby holding the two pieces together.
A lawn mower spark plug is used to ignite the air and fuel mixture in the same manner as the spark plugs in an automobile. Made of ceramic surrounding an iron core, a lawn mower spark plug is situated in a steel base. The spark gap in a lawn mower spark plug is set in the same manner as an automobile spark plug. After checking with the lawn mower's service manual, the spark gap can be set by grasping the electrode's tang with a set of pliers and pulling it open or pushing it closed until it meets the specified gap when a feeler gauge is inserted into the opening.