Abacus Raising and Lowering Columns

Article from Abacus's September 1964  brochure

Ever wondered how hinged columns are operated? This atricle from 1964 gives us an insight in to the secrets of the Raising and Lowering column.

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Copyright(c) 2006 Claire Pendrous. All rights reserved.

Please note that all pictures are by Claire Pendrous, or are part of the Claire Pendrous photographic collection unless otherwise stated; none of these images can be copied without obtaining prior permission.