Paving surface material for driveways and roads, comprised of small compacted pieces of stone. It was invented by John McAdam who combined it with tar to make Tarmac. An asphalt binder was added, and the resulting product, called Tarmacadam, was used frequently approximately 50 years ago.
Brazing, which is a process of bonding metals together by use of an additional metal that melts at a higher temperature than 840 degrees F and lower than the melting point of the metals being joined, by use of an automatic or operator controlled heat application, often with a brazing filler metal feed. Machine brazing is often more consistent.
Light weight, strong and bendable this silver white metallic chemical element is used in making several alloys, one of which is used to tall ladders. It burns with a hot white light making it usable in flashbulbs, etc. Atomic symbol Mg. Atomic Number 12. Atomic weight of 24.312. Melting point 651 degrees C. Boiling point 1107 degrees C.
Lock cylinder that has magnetic pin in a plug keeping the lock closed. When a key has magnetic inserts that match the polarity of the pins, the pins move out of their slots due to being repelled by a like magnetic pole, making the lock open.
Starter with an electromagnet to open and close the circuit of an electric motor. By use of a manual mechanical switch between the starter and the power supply, the power going to the motor can be interrupted if the magnetic starter fails in the closed position.
Hardwood coming from any of the trees of the mahogany family, especially the hard reddish-brown to yellow wood of the tropical American tree, which is used for furniture, interior trim and finish and cabinets. Both solid and veneer forms of this wood are used.