US astronomer Clyde Tombaugh discovered the planet Pluto its existence had been predicted 14 years earlier by US astronomer Percy Lowell 

450 people drowned when a dam burst near Los Angeles, US 

Bronze statue of Christ on Argentine-Chilian border dedicated 

British troops occupy Bloemfontein, Orange-Free state 

Joseph Priestley, English scientist, 1733 Percy Lowell, US astronomer, is born 

German-born British astronomer William Herschel discovered the planet Uranus