Featured Microscopist: Spike (M.I.) Walker

Sulphur Crystals

Sulphur crystals

A preparation of sulphur crystals (from the melt) was imaged between crossed polars with the assistance of a diffraction grating. A disk made from cleared base of Polachrome 35-millimeter film was placed at the back of a 4x/0.16 NA planapochromat objective to serve as the diffraction grating. The method is very time-consuming, and independent rotation of stage, polarizer/analyzer combination, and diffraction grating are useful if too much frustration is to be avoided. The microscope was a Zeiss Ultraphot lll coupled to an automatic 35-millimeter photohead. Photographed with Fujichrome Velvia. (10x)


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