WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. NEW YORK APRIL 3 1875. THE SAXBY AND FARMER SAFETY SWITCHES AND SIGNALS. Fig. SIGNALS. RAILWAY SWITCHES AND AND FARMER'S SYSTEM OF 1{PF Fig 2—SIGNAL HOUSE SWITCHES AND SIGNALS, scientific american, 1875-04-03
WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. NEW YORK APRIL 3 1875. THE SAXBY AND FARMER SAFETY SWITCHES AND SIGNALS. Fig. SIGNALS. RAILWAY SWITCHES AND AND FARMER'S SYSTEM OF 1{PF Fig 2—SIGNAL HOUSE SWITCHES AND SIGNALS, scientific american, 1875-04-03
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