Final answer:
The passage provided uses personification by giving life-like qualities to a laboratory mechanism, which suggests a presence observed by the onlookers.
Step-by-step explanation:
The passage provided utilizes personification as figurative language. Personification is a form of figurative language where human qualities are attributed to objects, animals, or ideas. Although the passage mentions a flickering light and a silhouette which could suggest an atmosphere, the primary figurative element is the large mechanism 'which we had seen before our eyes.' This suggests that the mechanism itself was being observed almost as if it had a presence or life of its own, hinting at personification. No explicit comparisons like a simile direct comparisons like a metaphor or exaggerations like hyperbole are present.