Note 10 — RESEARCH I.
Reading edition
This airholder, considered as a pneumatic instrument, is of greater importance, and capable of a more extensive application than any other. It was invented by Mr. W. Clayfield, and in its form is analogous to Mr. Watt’s hydraulic bellows, consisting of a glass bell playing under the pressure of the atmosphere, in a space between two cylinders filled with mercury. A particular account of it will be given in the appendix.