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.

Cat. No. 43BR20 Category:

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 call is heated, expansion prevents it from passing through the hole. overall length:215mm.