C, is 15 inches in diameter and has 8 feet stroke. on the lines, keeping one radius on each side in constant con- LIGHTNING RODS, It drives two condensing air pumps, P P, which work al- which may be described as follows: tact with them respectively. An abutmentis formed by a ternately, one on each… … are joined together. 7 is ametallic strip, doubled up the air in the chamber; but when, owing to the with- or corrugated so as to form a tube with spiral flanges. Ato the joints of the rod are coupled by pieces cross shaped in section and secured by rivets and bolts. yp has four twisted rods with…
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