The Doctor and Good Roads. Microscopic Drawing. THE WESTERN UNION TIME BALL SERVICE. WINDLASS AND ELECTRIC TRIPPING MECHANISM. THE WESTERN 'UNION TIME BALL TOWER. Hints for Boys. The Telephone in New York., scientific american, 1892-06-18
The Doctor and Good Roads. Microscopic Drawing. THE WESTERN UNION TIME BALL SERVICE. WINDLASS AND ELECTRIC TRIPPING MECHANISM. THE WESTERN 'UNION TIME BALL TOWER. Hints for Boys. The Telephone in New York., scientific american, 1892-06-18
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