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Index Entry
Sixty Degreeness:
“… The particles which make up cement are sifted sand and gravel, which, though they look rough, pack averagedly as spheres would pack-- in 60-degree angular packing. Few people think of cement that way, but if it is shaken down, agitated well, and lubricated together with a colloid, it will automatically avail itself of nature’s tetrahedral structuring in ‘closest packing’ pattern.”
