On an improved form of pipeclay triangle
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Coleman, J. B.
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Article
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1892
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Wiley (John Wiley & Sons)
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Tho ii11:ncs iii ihlic~ nre tliasc 01 incii!bcrj or Comniitteo w h o n-iiro at Iic end of the cumnt Swion. Tho following Imvc ~M I I clcctcd.to Ill1 1110 vnenncirs. rind. will tnko olnm in Julv ncxt :-~'icr-~h7lr'ilrnrr: 17. C l o w ~.