Word: bulb
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...first series, Sesame Street used two clowns, Buddy and Jim, to illustrate problem solving. They were a walking Polish joke, one lifting and turning the other to screw in a light bulb, refusing a nail because it was turned the wrong way. In its new series, Big Bird helps Susan set the tableby putting the saucers on top of the cups. No child in the world would make that mistakebut every child delights in its ludicrousness...
...Light-bulb manufacturers, under an FTC ruling due to take effect in January, must include on cartons sold in retail stores the life expectancy of their bulbs...
...Kalliroscope resembles a glass-fronted picture frame and is filled with a nonflammable cleaning fluid called perchloroethylene. A multitude of tiny flat crystals suspended in the liquid reflect light. Thus when the Kalliroscope is held in the palm of a hand, or under a bulb, or near any source of heat or cold, it produces a demonstration of convection currents appropriate for a Physics I classroom: warmer liquid rises while cooler liquid descends, forming currents that rearrange the light-reflecting crystals into ever-moving patterns. A mere change in position sets a small Kalliroscope...
...same technology: they are capable of transforming tiny amounts of heat into electrical currents. Once amplified, those currents are fed into a display unit that shows the rise and fall of the infra-red radiations as visible light. The display may be as uncomplicated as an ordinary light bulb whose fluctuations are recorded on photographic film. In some cases it is a more sophisticated cathode-ray tube system that produces a TV-type image...
...shown simply in black and white with shades of gray representing different temperature ranges. But color can be added with the use of appropriately positioned filters. Whenever there is a sufficient change in heat intensity, a different color filter pops in front of the thermograph's internal light bulb. The resulting flickerings are then recorded on color film, with each hue representing a different temperature range. Colors are arbitrarily selected. Warmest areas are represented by shades of red and orange. Medium temperatures come out in yellow and green, while the coldest spots are violet, blue and black. The advantage...