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...double discharge platforms allowing passengers to get on and off from both sides. The other thing allows the huge amounts of people to navigate the station is the fact there are no bottle necks caused by ticket barriers barring the exit. Commuters can just pile off the train and get straight to work. All this is because of the ‘headway’ – what the station’s...

...double action from top and bottom are best, to produce as uniform a density throughout the component as possible. Tooling tolerances are to within 0.013–0.005 mm with good surface finishes. Multi-level parts can be produced using multi-level tooling. High production volumes are required to amortise the high tooling costs (>1000,000 parts year-1). Compacts rely on cold...

...double over the next 25 years. But what of the fertility rate? How might that affect population size in just the UK? The following chart is a particular sort of chart known as a population pyramid, taken from an interactive population projection application also released by the ONS. [ONS population pyramid] The chart shows separately the make up of a population in terms...

...double imaging or colour fringing. If there is any misalignment, then reject them." A first telescope There are two types of telescope - reflectors, which use a mirror at the bottom of the telescope to image, and refractors, which have a lens at the top of the tube. It is the diameter of the mirror or lens that determines the resolution - the bigger the diameter, the...