What Did Barney Rubble Do For A Living?

In 1960, the first ever prime-time animated TV series took to the air, The Flintstones. Fred Flintstone was a blustery, quick-tempered, loud-mouthed, blowhard. Fred's best friend and next door neighbor was the affable and always loyal Barney Rubble.

Fred Flintstone is a bronto-crane operator at the Slate Rock and Gravel Company. But Barney's occupation is, for the most part of the series, unknown, though later series depict him working in the same quarry as Fred. But what exactly did Barney Rubble do for a living?