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N-Type Material:N-Type Material, P-Type Material. When a semi-conductor material such as silicon is doped with certain impurities, we can end up with either N-type material or P-type material. If we sandwich a layer of P-type material with a layer of N-type material, we end up with a diode. If we add a further layer of either N-type material or P-type material, we end up with a transistor, either an NPN transistor or a PNP transistor. | |
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National Transport Museum:
The Transport Museum Society of Ireland began with an abortive 1949 effort to preserve three Dublin trams. Totally voluntary, the Society became a limited company in 1971 and is now a registered charity, operating to international museum standards. If you have Google Earth installed on your machine, download and open this file to view the museum's location. Sat Nav Coordinates: Some pictures from the Museum:
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Navan Hire and Hardware Ltd.:We are leading Builders Merchants and Hire Specialists, offering customers a huge range of timber, building materials, plumbing and heating supplies, plus a comprehensive plant,equipment and scaffolding hire service. Apprentices (Note: we have only begun recording apprentics here from cp12b, so there may be more than those listed)
Company Contact: Evelyn Donegan |
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Nearside:Term used to designate a particular side of a vehicle. With plant vehicles it is problematic to describe a side of a vehicle as 'driver's side' or 'passanger side'. This is because plant vehicles often don't make provision for passangers, or the steering wheel may be located in the centre of the vehicle. To avoid this problem we identify the side of a vehicle by describing it as nearside or offside. The nearside is the side of the vehicle nearest to the side of the road, when the vehicle is driven on the road under normal conditions - think of the nearside as the side nearest the ditch. The offside is the side off away from the side of the road. Corners of the vehicle may be described as follows:
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Needle Roller Bearing:
Needle roller bearings are used in places where space restrictions prevents the use of ball bearings or roller bearings. | |
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Needle roller bearings:Used to support and sustain radial loads in places where space is seriously restricted and ordinary roller bearings will not fit:
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Needle Valve:In construction plant fitting, the term 'needle valve' is generally taken to refer to the needle like valve that is forced upwards on to its seat by the action of a float in a carburettor float chamber.
As the float chamber fills, the float rises and forces the needle valve on to its seat. As the float chamber empties, the float sinks, allowing fuel in past the needle valve to fill the float chamber. Needle valves are used in both diaphragm type carburetors and float chamber type carburetors on small plant engines. |
Negative Earth:Up until the mid 1970's many vehicles still used positive earth electrical systems. Before electronic components became common in vehicles, most of them used positive earth systems. With the availability and reliability of cheap and efficient electronic (solid-state, no moving parts) components, it became necessary to switch to negative earth systems. Electronic components and devices must use negative earth electrical systems. That is why modern vehicles all use negative earth systems - the negative terminal of the battery is bolted directly to the body and chassis of the vehicle. |
Neoprene: |