know here all things of Seismograph was invented by which scientist | John Milne discovered what ?
question : Electricity was invented or discovered by whom ?
answer : The famous scientist named John Milne was the inventor of Seismograph in the year of 1839.
question : John Milne invented which thing and when ?
answer : In ‘1839’ year the well known scientist whose name is ‘ John Milne ‘ was the inventor of Seismograph.
question : when and by whom Seismograph was discovered ?
answer : Seismograph was the discovery of John Milne which was discovered in 1839 year.
so in short we can say –
invention : Seismograph
inventor : John Milne
year : 1839
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