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VELUX is a Danish manufacturing company that specialises in roof windows, skylights, sun tunnels and related accessories. The company is headquartered in Hørsholm , Denmark and is a part of VKR Holding A/S. VELUX Group is a founding partner of the global Active House Alliance.
Velfac A/S is a Danish company who produces windows for the building industry. The company is part of VKR Holding A/S, which also owns, among other things, Velux and Rationel. Velfac exports to several countries and has sales offices in Great Britain , Ireland , Sweden and Denmark .
The Hawkins Electrical Guide was a technical engineering book written by Nehemiah Hawkins, first published in 1914, intended to explain the highly complex principles of the new technology of electricity in a way that could be understood by the common man.
The Magna Organ was an electric-fan driven free reed organ with the microphone sealed in a soundproof box, instead of the electrostatic pickups used on electrostatic reed organs. [ note 1 ] Early designs of the Magna Organ were a kind of additive-synthesizer that summed-up the partials generated by the frequency-multipliers .
The basic principles behind optical waveguides can be described using the concepts of geometrical or ray optics, as illustrated in the diagram. Light passing into a medium with higher refractive index bends toward the normal by the process of refraction (Figure a.). Take, for example, light passing from air into glass.
Installation may involve shrink-fitting, heating the cylinder head and cooling the valve guide so as to ease insertion, then driving the new guide in quickly with a press or a hammer. Once the parts return to room temperature the new valve guide will be solidly in place and ready to be reamed and honed to proper diameter.