. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1843.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. BALLARD'S ICE BOAT. 79. wsgmmmw .^ The above engraving is an isometrical view, drawn to a scale of eight feet to the inch, of the ice boat, for which Mr. S. Ballard, had the honour of receiving of the Institution of Civil Engineers a Telford medal. This boat was first used in the year 183", on the Hereford and Gloucester Canal, and has been in operation, whenever required, ever since. It breaks the ice by ploughing or fo
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1843.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. BALLARD'S ICE BOAT. 79. wsgmmmw .^ The above engraving is an isometrical view, drawn to a scale of eight feet to the inch, of the ice boat, for which Mr. S. Ballard, had the honour of receiving of the Institution of Civil Engineers a Telford medal. This boat was first used in the year 183", on the Hereford and Gloucester Canal, and has been in operation, whenever required, ever since. It breaks the ice by ploughing or forcing it upwards, and does not require more than one-fourth of the power necessary to break the ice on the old plan of forcing it downwards against the water. The ice-breaking frame A consists of three pieces of timber marked n, fastened together by two cross pieces c and e. That part of the frame which lies over the boat is boarded or planked over; one part so as to form a platform for men to stand upon, the other part raised in the middle and cased with sheet iron, that the ice may not lodge on it. The frame lies on the front of the boat, which is sloped down as shown at a b. The frame is made with deal timber; the two out- side pieces each 27 ft. G inches long by 9 in. by Si in. the middle timber 31 ft. long by 12 in. by 7 in. These timbers are rounded on the top as far as they project over the front of the boat, and the uDder sides are made narrower than the top sides. The boat is decked over from a to b, and when the ice is very strong, she has a temporary boarding over, of inch board, as far as the centre. The spar B, which projects over the stern of the boat, has the large end chained down to the middle of the boat. The piece of timber C is attached to the spar B by a chain. It is about one ton in weight, and prevents the boat rising behind when the ice presses upon the frame on the front of the boat. It floats on the water and the chain is strained in proportion to the
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