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Accelerometer
An accelerometer uses the inertia of a mass to measure the difference between the kinematic accelaration with respect to inertial space and the gravitational acceleration. There are several principles that can form the basis for the design of an accelerometer. One of the first successful accelerometers used a rate gyro mounted as a pendulum mass. In more recent versions a rate gyro is used with a mass offset on the float. Another design is based on the inertia of a proof mass inside a low friction case, and a third is based on the difference in vibration of two thin metal tapes suspended inside a case with a proof mass suspended between them. In later designs the proof mass is suspended from double tuning forks fabricated on quartz substrara. Each type of accelerometer is described in terms of its fundamental component parts and a simplified version of its output equation. (Fundamentals of High Accuracy Inertial Navigation, Chatfield, Volume 174, p68)

Chemical Engraving
This is a closely related process in which chemical machining techniques are used to remove metal from selected areas of nameplates or other components to produce the lettering, figures, or other nomenclature required. Chemical engraving is a substitute for mechanical pantograph engraving. Lettering can be either deprressed or raised.
Typical parts produced by chemical engraving are instrument panels, nameplates, printing plates, signs, and pictures. Parts require engraving with fine detail are especially suitred to chemical engraving. (DFM Handbook, 2nd Edition, Bralla, p.4.227)

Poly-Ond a new technology for plating metal
Poly-Ond, a proprietary formulation developed in 1976, is a liquid bath process which chemically deposits nickel phosphorus, impregnated with polymers, on the surface of metal parts. This process permits the use of less expensive metals when anticorrosive materials are called for. (Modern Manufacturing Processes, Brown, p.44)

BNC Connector
Another type of coaxial connector that could be used in a residental system on RG58 and RG6 cable in data networking and some audio/visual applications is the Bayonet Neill Concellman (BNC) connector. The male portion (plug) of a BNC connector has a bayonet like shell with two small pins that fit into spiral slots located on the female portion (receptacle) of the connector. The plug is inserted into the receptacle and twisted into a locked position.
There are two styles of BNC connectors: a BNC-T connector and a BNC barrel connector. (All in One, 2nd Edition, Gilster&Heneveld, p.34)