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Open Specific gravity beads probably made in Glasgow © National Museums Scotland 000-100-104-221-C	Open Specific gravity beads probably made in Edinburgh © National Museums Scotland 000-100-104-227-C	Open Specific gravity beads probably made in Glasgow © National Museums Scotland 000-100-104-256-C	Open Instruction book, for set of specific gravity beads © National Museums Scotland 000-100-104-267-C
Open Instruction book, for set of specific gravity beads probably made in Edinburgh © National Museums Scotland 000-190-002-208-C	Open Slide rule & thermometer, from set of specific gravity beads probably made in Edinburgh © National Museums Scotland 000-190-002-207-C

"gravity / bubble" in what