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Difino
| • | When the modus operandi of a new product or process is fundamentally different from its predecessor, then obsolescence will not be far away. This obsolescence may also include a loss of process machinery, materials processing methods and application knowledge - once gone, it may never return. The speed at which the obsolescence occurs is, in part, due to the depth of the paradigm shift the new technology engenders. This transitional change may happen quickly - such as the fairly rapid death of the slide rule once the low-cost 'basic' pocket calculator was introduced c.1972 - or more slowly (such as in the case of the reciprocating steam engine or mechanical television).
As the march of the progress of technological development is ever onwards and forwards, it is, perhaps, worthwhile to reflect on those devices, processes, materials and finished articles that have fallen by the wayside. Such finished goods utilizing these anachronistic technologies are now attractive to collectors as they hearken to a simpler age.
But what devices perished so rapidly that they are in danger of becoming forgotten? It is worth noting a few examples, such as:
·Wire recorders - largely replaced by magnetic tape c.1951 except in certain specialist applications.
Source: [wikipedia: list of obsolete technologies]
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