A hundred years ago, the public works department of Baltimore had equipped this truck with a wireless receiver, capable of receiving messages while the car was being driven at high speed through streets flanked with high buildings. The set was capable of receiving messages within a 10 mile radius, allowing crews to be dispatched quickly to any emergency situation. Among other equipment, the truck contained a pump capable of pumping 12,000 gallons per hour. It is shown here in the March, 1915, issue of Popular Mechanics.

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