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They are 2-5/16" wide X 2-1/2" tall (Outside Dimension) and the (Inside dimension) is 1-9/16" wide X 1-3/4" tall with 3/8" walls
Each Cavities size is apx Inside Length: 3/8" Inside Width: 7/32" Depth: 1/16"
These tubes are 6" long and are used to test for gold or other metals while doing a assay
Assay Equipment and Supplies
Chapter II: Alloys of Gold
"The Metallurgy of Gold" by T.K. Rose-Assay-Melting-Refining-Testing-573pgs Book graphite They are 2-5/16" wide X"The Metallurgy of Gold" by T. K. Rose This book is the seventh edition in a series of publications on the metallurgy of gold. This seventh edition was published in 1937 and is a highly technical treatise on gold treatment. by Thomas Kirke Rose & W. A. C. Newman 7th Edition Reprinted 2010573 pages Soft Cover CONTENTS Chapter I: The Physical and Chemical Properties of Gold Chapter II: Alloys of Gold Chapter III: Chemistry of the Compounds of Gold
