Model of a cylindroid, 1895-1900

Model of a cylindroid, 1895-1900.
Wire model of a 'cylindroid' by Howard Grubb, Dublin in brass glazed cylindrical case on a wooden base. The model was made on the instructions of Robert Stawell Ball who wrote the definitive work 'A treatise on the Theory of Screws' in 1900. Thomas Grubb, and later his son Howard, ran a firm of telescope makers in Dublin from the 1830s until the 1920s.
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