† prism batteryn.Obsoleterare a form of Leclanché battery in which the anode is a carbon plate in contact with two prisms formed from compressed manganese dioxide and carbon powder.
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a1884 E. H. KnightPract. Dict. Mech. Suppl. 723/1Prism Battery, a form of Leclanché battery in which the usual porous cup is dispensed with, and a pair of compressed prisms containing all the materials formerly used in the porous cup are substituted for it.