Optimism laid down the railroad, but pessimism made it practicable with the air brake and the block-signal system. Optimism designed a ship to sail daringly into the skies — and fall perhaps at times. So pessimism designed the parachute.
W. H. H. MacKellar, The Rotarian (May 1939).
Categories
W. H. H. MacKellar
![](https://thisiscommonsense.org/wp-content/uploads/2023/03/CD023B12-0296-4D34-8B6B-BEECB3AF1462.jpeg)