This device was a deconstructed study model that was used in Helsinki to support engineering education. The mechanically working models provided a hands-on introduction to the principles of operation, development and design of motorized machinery.
The inscription “Polytechnisches Arbeits-Institut J. Schröder” reveals that this model was made by a German company that has been manufacturing educational models since the 1830s. This model illustrates the sliding valve of a steam engine with a Joy valve gear, a mechanism that translates vertical motion into horizontal through a series of links. A similar machine was found in the manufacturer’s catalog at least as early as 1899. The model has been used by the Helsinki Institute of Technology, which at the time of donation was located on the edge of Hietalahti Square.
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