Thursday, September 27, 2007

What is a spectrograph?

It is an instrument for producing and photographing a spectrum. Used to measure properties of light over a specific portion of the electromagnetic spectrum.

Sunday, September 16, 2007

How is paper made?

Most (though not all) paper is made from wood. Logs are stripped of bark, chopped into very small pieces and then pulped. The pulping stage is important, for at that time various chemicals and things like clay, or old rags, or even straw, are added, which determine the quality, colour and smoothness (or roughness) of the finished paper. Once pulped, the paper is rolled into sheets which are dried out before being cut to required shapes and sizes.

Thursday, September 13, 2007

What is a boutique?

From the French for shop, the word is now used to indicate a particular kind of small store that specializes in ready-made fashion clothes, and perhaps crafts, scents and soaps.

Wednesday, September 5, 2007

What is an altimeter?

It is a dialled meter for showing how high an aircraft or spacecraft
is above ground. Most altimeters work using air pressure. The measurement of altitude is called altimetry