The design and construction of a 90' electrostatic prism is described. The device is used to deflect hypervelocity dust particles produced in a horizontal van der Graaff accelerator to simulate micrometeroid impacts on dusty lunar and asteroidal surfaces where vertical incidence must be provided.

ChemInform Abstract The alkynylphoshonates (III) and the saturated derivatives (VII) and (XI) are prepared by common methods. The ethynyl compounds have moderate anticholinesterase activity.

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