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275: "The First Colour Photograph"

Interesting Things with JC #275: "The First Colour Photograph” - On May 17th 1861 Scottish physicist James Maxwell revealed the first colour photograph at King's College in London. The photo is actually a composite of three black and white pictures, each taken through a red, green and blue filter. The images were overlayed through projection of three similarly filtered lenses, which resulted in display of a colour photograph.

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Podcast, Science, History JC Podcast, Science, History JC

201 - Interesting Things: Lead Glass

Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical glass. In past decades, it was a popular material used to create decorative vases and bowls as well as crystal glasses and decanters. Lead glass is also known as X-ray glass or radiation shielding glass as one of its major applications is in the absorbance of high energy radiation while maintaining optical transparency. Also, lead glass has a lower thermal conductivity than lead-free glass. Interestingly, even though stained glass windows are a type of leaded glass, industry experts often use them separately to create distinction between the two.

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Podcast, Science JC Podcast, Science JC

192 - Interesting Things: Color Perception

It's the surface of an object that reflects some colors and absorbs all the others. We perceive only the reflected colors. Perceived color depends on how an object absorbs and reflects wavelengths. Human beings can only see a small portion of the electromagnetic spectrum, from about 400 nm to 700 nm, but it’s enough to allow us to see millions of colors!

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