he poleisa prong, of which the pivots are ar- D, that may be driven into the object against which the end ranged. These frames are of the ladder rests; but the main object of the prong is to supported by pivots on trucks i fornfed of the platform, B, = | aid in climbing the sides of a building, and… … which the diagonal shank of the frame passes. The con- ments, we learn, have been highly successful, so much so necting bars, A, are pivoted to the sliding blocks, and the that it is said to be easier to talk from New York to Bos- outer ends of the boxes are pivoted by ball and socket joints ton on…
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