S. Ballard
- (1841): A Method of Breaking Ice, by Forcing it Upwards Instead of Downwards; Practised on the Herefordshire and Gloucestershire Canal, in the Winters of 1834-35 and 1836. Dans: Minutes of the Proceedings of the Institution of Civil Engineers, v. 1, n. 1837 ( 1841).
- (1841): Description and Drawing of the Ice Boat. Dans: Minutes of the Proceedings of the Institution of Civil Engineers, v. 1, n. 1838 ( 1841).
- (1841): A Description of the Turnbridges on the Herefordshire and Gloucestershire Canal. Dans: Minutes of the Proceedings of the Institution of Civil Engineers, v. 1, n. 1839 ( 1841).
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