[p. 18]: “altered as in fig. 4” should be “altered as in fig. 6”
[p. 18]: “lightness” changed to “tightness” (absolute tightness. Such)
[p. 22]: “entirely. As” changed to “entirely, as” (out entirely, as)
[p. 28]: “valve shown in fig. 4” should be “valve shown in fig. 6”
[p. 45]: “with” inserted (ground, with a)