| 摘要 |
Advertising envelopes are anchored light envelopes that display an advertising (32). They are filled with a gas. They are made with a light plastic film or paper. Said advertising envelope and gas together are heavier than the air. When said gas is heated, whether indistinctly during the day by the sun or at night by an electrical source the envelope gets lighter than the air. The fixed envelope raises and displays said message. Other optional elements used to set the advertising envelope on place that not necessarily all embodiments have are: an electricity generator (41), an electricity reservoir (54), a conductive element (51), a resistance (43), a lamp (43), a funnel (23) acting as a valve, a vehicle (27) that drags the envelope (32), a bridle (21), control lines (24), a fan (40), and a photoreceptor (42) connected to an electrical switch (57).
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