1. In the line "blithe and strong," the adjectives "blithe" and "strong" enhance the parallelism by describing the mechanics singing their varied carols.
2. The adjectives "delicious" and "strong melodious" are used in the lines:
- "The delicious singing of the mother, or of the young wife at work"
- "Singing, with open mouths their strong melodious songs"
These adjectives add richness and depth to the descriptions of the singing individuals, emphasizing the diverse and harmonious nature of their voices.
3. Additionally, throughout the poem, adjectives like "varied," "young," and "robust" are used to characterize the different individuals singing their songs.
These adjectives contribute to creating a vivid and colorful image of the various people and their activities in America.