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In Assaying for Everyone" 1910, p 27.
"The crucible commercially known as Battersea "B" or 20 gram size will be found convenient for use when 1 assay Ton of ore is taken; size "F" or 30 gram when 2 Assay Tons are used, together with the necessary amount of flux."
- J. Reginald Smith
Read more: http://andy321.proboards.com/thread/77052/assaying-gold-silver?page=1#ixzz4TDNtzIyu
That sounds small for a 20 gram crucible to hold 1A.T. of 29.166 grams pulp + 20 grams lead + reducing agent etc. Is the information correct?