One of his devices had eight noisemaking  sculpted frogs that would catch copper balls that fell from dragon heads.
This author of Four Distressed Poems compared the heavens to a hen's egg. His other literary  contributions include a poem in which a river is one of the title "four sorrows" that keep him from a woman  and the introduction of a literary style of hypothetical discourse called shelun in a work about his idleness.  This man reinvented a contraption consisting of a man like figure on a cart that would always point south.  He's not Archimedes, but he did independently invent the odometer. He was the first to use water to run an  armillary sphere, allowing for better astronomical predictions. One of his devices had eight noisemaking  sculpted frogs that would catch copper balls that fell from dragon heads. For 15 points, name this Han  dynasty inventor of a seismometer.
This author of Four Distressed Poems compared the heavens to a hen's egg.
Zhang Heng