| 摘要 |
1378525 Whistles E B FONTLLADOSA 31 Dec 1971 [4 Jan 1971] 61007/71 Heading G5J A toy whistle is constituted mainly from a mass of caramel or toffee, Fig. 2. The mass is moulded to provide a cavity within, and the upper end is flattened so that the walls contract to form a segmental opening 2. A semicircular opening 3 is provided to constitute a system for passing air through cavity in the manner of a whistle. Inserted to a required depth through the lower end of the main body is a plastics cylindrical hollow tube 5, with orifice 8, to allow variation by finger touch, of the quantity of air circulating in the instrument, thereby altering the frequency of the note produced. |
