Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 754
d of thepontoon; D D, two of the sliding blocks for steadying the ship ; andB E are two double purchase crabs for raising weights, and lifting therams when required. These can be run about any where upon the topplatforms, and are very useful adjuncts. Hydraulic Lift at the Victoria Bocks. 295… … containing the ram rests upon a block of concrete, which fills up theinside of the column to the required height. 296 Civil Engineering. It will be needless for us to say much more upon the subject of Mr.Clarks invention. Its superiority over the old graving dock for manypurposes is sufficiently…
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