Ball & Ring Gravesande”s
$12.75 excl. GST
Diametrical expansion. A metal ring with accurately machined hole, mounted on a rod with an insulated handle. A close fitting metal ball is attached to the rod by a brass chain. When call is heated, expansion prevents it from passing through the hole.
Description
Diametrical expansion. A metal ring with accurately machined hole, mounted on a rod with an insulated handle. A close fitting metal ball is attached to the rod by a brass chain. When ball is heated, its expansion prevents it from passing through the hole. Overall length: ~215mm.
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