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Home > All Images > 1999 > January > 22 Jan 1999

Images Dated 22nd January 1999

Available as Framed Photos, Photos, Wall Art and Gift Items

Choose from 16 pictures in our Images Dated 22nd January 1999 collection for your Wall Art or Photo Gift. Popular choices include Framed Photos, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


Woman holding an Interpane thermotrope window Featured 22 Jan 1999 Print

Woman holding an Interpane thermotrope window

Thermotrope window (image 1 of 2). Researcher Helen Rose Wilson holding an Interpane thermotrope window. A thermotrope window will darken when the temperature reaches a certain point. This will reflect any sunlight which would normally enter a building. This is useful for controlling room temperatures. The glazing is based on a heat reactive layer. Below a pre-set temperature the layer will remain clear as seen in the image. Above this temperature the layer will become cloudy, thus reflecting the sunlight. This glazing was developed at the Institute for Solar Energy (ISE), Freiburg, Germany. See photo T830/103 showing the window when it is opaque

© VOLKER STEGER/SCIENCE PHOTO LIBRARY