In 1912, Reginald Fessenden demonstrated the first successful sonar. #Poetry #Science #History #Electrodynamics #Sonar #Fessenden (https://sharpgiving.com/thebookofscience/items/p1912b.html)

1906: AM broadcasting - The book of science - In 1906, Reginald Fessenden made the first AM radio broadcast of voice and music. #Poetry #Science #History #Electromagnetism #AMRadio #Fessenden (https://sharpgiving.com/thebookofscience/items/p1906c.html)

In 1903, Reginald Fessenden was the first to use a bare-point electrolytic rectifier as a radio wave detector. #Poetry #Science #History #Electromagnetism #Detector #Fessenden (https://sharpgiving.com/thebookofscience/items/p1903c.html)

In 1902, Reginald Fessenden invented the hot wire barretter based on an effect discovered by Humphry Davy in 1821. #Poetry #Science #History #Electromagnetism #Barretter #Fessenden (https://sharpgiving.com/thebookofscience/items/p1902b.html)

In 1901, Reginald Fessenden invented heterodyning for combining frequencies, the basis of AM radio transmission. #Poetry #Science #History #Electromagnetism #Heterodyne #Fessenden (https://sharpgiving.com/thebookofscience/items/p1901b.html)