A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 402
?>» … PIL 391 PIL second, or internal frame, D E, is situated ; likethe other, it has four parallel pieces, 1) and E,connected together into one frame by crosspieces ; at the top it has two pieces a, a, whichrest upon the beam B, and suspend its weight,and on these it is capable of sliding backwardsand…
Encyclopedias and dictionaries · Aeronautics
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