Thermogram of the front of an office block showing the distribution of temperature across the exterior surface of the building. The colour chart runs from white/yellow the hottest regions through to light green/purple the coldest regions. Much of the building is cool, apearing in light green & purple. Some areas, however, are hot (white & yellow), indicating heat loss through windows. See H584/049 for ordinary 35mm photograph. Original is 6x7cm H584/041.

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