They're both made of metal. An adjustable metal column is hollow and has a large adjusting screw positioned either at the top or the bottom. Often you won't see that screw because it's positioned downward and encased in the poured concrete.
The term lally column, strictly speaking, was a proprietary name for the concrete filled steel column invented by John Lally. A lally column has no adjusting screw.
However, lally columns or lolly columns are terms that are widely used in my area (Hudson Valley, NY) and in various construction dictionaries for any steel column.
For further information about this topic see my article
Inspecting Adjustable Steel Columns.
All text and photos © Arlene Puentes
Do not copy
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