ided with two radial openings, K and L, be- in the accompanying engraving, relates to wind instru- tween which is a cut-away port, D. The valve seat, ments such as cornets, horns, and the like, and pro- which is shown in Fig. 3, is similarly formed with vides means for readily lowering or raising… … an annular balancing chamber, H, formed by a cylindri- Schenectady, New York, that the toy would lose little, cal casing bolted to the valve seat. Communication between the interior of the valve and this chamber is rangement being such that the formation of abrupt had through the port shown. A…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-589-382.webp)
