Matches in DBpedia 2015-10 for { ?s ?p "Solomon Andrews (1806-1872) was an aviator and dirigible airship inventor. The difference of specific gravity between the balloon and the surrounding atmosphere could be converted by a system of inclined planes to steer the craft, without a motor. He referred to his propulsion as "gravitation." The craft was not normally trimmed to be neutrally buoyant. Instead it would be cycled between positive and negative buoyancy."@en }
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- Solomon_Andrews_(inventor) comment "Solomon Andrews (1806-1872) was an aviator and dirigible airship inventor. The difference of specific gravity between the balloon and the surrounding atmosphere could be converted by a system of inclined planes to steer the craft, without a motor. He referred to his propulsion as "gravitation." The craft was not normally trimmed to be neutrally buoyant. Instead it would be cycled between positive and negative buoyancy.".