The calculating machine (a single column adder) of the swiss clockmaker Victor Schilt (1822-1880) was exhibited at the Great Exposition in Crystal Palace in London in 1851 and received a bronze medal, after the calculating machines of Staffel and Thomas.
The machine of Schilt was almost an exact copy of the machine of Jean-Baptiste Schwilgué and there is a clear reason for this—Schilt worked some two years in the workshop of Schwilgué in Strasbourg (around 1847-1848), before to return to his hometown (Grenchen, canton of Solothurn, Switzerland), where he built many tower clocks.
In the workshop of Schwilgué in Strasbourg Schilt was mainly busy working on tower clocks, but undoubtedly he was engaged also in the making of calculating machines, because in the same 1848 he made the first copy of his machine. At the 1851 London Exhibition Schilt received an order for manufacturing of 100 machines, but refused to produce them, probably because he wasn't the inventor.
Now a copy of the Schilt's machine, featuring an inscription V. Schilt, Mechaniker in Solothurn, is in the collection of Smithsonian Institution in Washington (see the photos below).
The calculating machine of Victor Schilt (Courtesy of the Smithsonian Institution)
It is a wood and metal device with measurements: 11.9 cm x 26 cm x 14.5 cm.
The inside of calculating machine of Victor Schilt (Courtesy of the Smithsonian Institution)
The front, top and mechanism of the machine are steel, while the case is wooden. The plate and zeroing knobs on the top and the nine digit keys across the front are made of brass. The machine adds numbers up to 299. Only one-digit numbers can be entered. The result is visible in a window on the plate.
Under the top plate of calculating machine of Victor Schilt (Courtesy of the Smithsonian Institution)