. American engineer and railroad journal . ront end is a convex disk of seel, stamped in the desired form,and secured to the body by rivets. A buffer of felt is attached to 380 AMERICAN ENGINEER, CAR BUILDER the end. The carrier is supported in the tube by two bearingrings made of fibrous woven material, located on the body of thecarrier a short distance from each end. These permit it to passthrough a bend in the tube of minimum radius without becomingwedged. The rear end of the carrier is closed by a hinged lidand special lock, which insures the impossibility of the carriersopening during tra
. American engineer and railroad journal . ront end is a convex disk of seel, stamped in the desired form,and secured to the body by rivets. A buffer of felt is attached to 380 AMERICAN ENGINEER, CAR BUILDER the end. The carrier is supported in the tube by two bearingrings made of fibrous woven material, located on the body of thecarrier a short distance from each end. These permit it to passthrough a bend in the tube of minimum radius without becomingwedged. The rear end of the carrier is closed by a hinged lidand special lock, which insures the impossibility of the carriersopening during transit. The carrieis when empty weigh about12 pounds; when loaded they weigh from 20 to 25. They holdfrom 600 to 800 letters each. The earliest practical use of pneumatic tubes for any kind is noted in a system of U inch pipes laid inLondon in 1853. These were employed for sendiug telegramsfrom the central station of the Electric & International TelegraphCo., to the London Stock Exchange, a distance of 220 Carrier for Letters. The system at present in use in London is known as the radial,employing one central and several minor pumping stations fromwhich the tubes radiate. The outgoing tubes were operated bycompressed air, the incoming by suction. Three-inch tubes areused. The London system iucludes 42 stations and 34 miles oftube. Liverpool, Manchester, Birmingham, Glasgow, Dublin audNew Castle are also equipped with pneumatic tube systems oftransportation. The city of Berlin has an extensive radial systemof tubes. In faris pneumatic tubes were first introduced in first system of pneumatic tubes for transportation of mailin the United States was installed in the city of Philadelphia in
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
