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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

A boom derrick is a lifting device that incorporates the advantages of a gin pole and the long horizontal reach of a boom. Use the boom derrick to lift and swing medium-size loads in a 90-degree arc on either side of the resting position of the boom, for a total swing of 180 degrees. When employing a boom derrick in lifting heavy loads, set it on a turn plate or turn wheel to allow the mast and boom to swing as a unit. A mast is a gin pole used with a boom. The mast can swing more than 180 degrees when it is set on a turn plate or turn wheel.  2, record 1, English, - boom%20derrick

Record number: 1, Textual support number: 2 CONT

Thus an invention by a Canadian contractor Benjamin Chaffey, a steam-powered boom derrick, was applied for the first time in bridge construction ...  3, record 1, English, - boom%20derrick

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Une invention de l'entrepreneur canadien Benjamin Chaffey, un derrick à flèche à vapeur, fut ainsi utilisée pour la première fois dans la construction d'un pont.  1, record 1, French, - derrick%20%C3%A0%20fl%C3%A8che

Record 1,  Textual support,  Spanish