What physical characteristics did early 19th-century mechanical verification systems typically rely upon?
Answer
The coin’s diameter and weight
Unlike modern systems that use complex electronic authentication, early 19th-century vending machines relied on simple mechanical checks to prevent fraud from slugs or foreign objects. If a coin was the correct size, it would fit through a designated slot or drop a specific distance, thereby triggering the release mechanism. If the coin was either too large or too small based on its diameter or failed to meet the necessary weight requirement, it would be rejected and directed into a return slot, ensuring that only properly weighted and sized payment was accepted.

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