From 1881 he had been assistant in office of the civil engineering company Essex Company and Lawrence .
Waldo had started his career as chief engineer of the water works of Lincoln , Massachusetts in 1868 at the age of 17 .
From 1881 Waldo had been assistant in office of the civil engineering company Essex Company and Lawrence .
Waldo had started his career as chief engineer of the water works of Lincoln , Massachusetts in 1868 at the age of 17 .