RUSHTON 1 has recently described a series of ingenious experiments which demonstrate the effect of humming on the induction of stroboscopic patterns in non-fluctuating illumination. By introducing a ...
Photochromic paint is pretty nifty – under exposure to light of the right wavelength, it’ll change colour. This gives it all kinds of applications for temporary displays. [Jiri Zemanek] decided to ...
SEVERAL methods for studying surface vibration modes using holography have recently been developed 1–3. These effectively contour the surface with interference fringes, which delineate points of equal ...
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