SEAGRAVE SELF-RAISING AERIAL TRUCK.
The illustration herewith shows the Seagrave aerial truck which has achieved a very enviable reputation throughout the United States during the past three years. The automatic principle of hoist or elevating of the aerial ladder consists of a series of heavy spiral springs similar in form and quality to those used under railway coaches, the springs themselves being confined within cylin ders and located upon the turntable. When the truck is not in service, and the ladder is down on its bearings, the springs are within the cylinders compressed. To place the ladder in motion and elevate the same it is very necessary to release the springs, which then automatically, by expansion, raise the main ladder of the aerial steadily and rapidly, the operation requiring but ten sec onds for the main ladder to be elevated. The safety and steadiness of the motion is augmented by the use of a screw governor. The speed of the hoist is simply controled by one operator, whose hand upon the lever determines the speed of the raising. The entire ladder of two sections can be fully extended by one man in fifteen seconds, while at all times it is directly under control. The special features of this truck are the great simpicity of the operating principles and attachments, there being absolutely nothing to get out of order or to cause complications or repairs. It is not only a life-saver, but a labor-saver also. The general principles of the Seagrave trussed construction obtain throughout the ladder service or may be the plain, straight Oregon form of ladders, if desired. The strong point of vantage which has made the truck so popular, as above stated, is the great simplicity and perfect relit. i ity of the automatic hoist, by means of the expansion of the spiral spring above described. Within the last thirty-six months there have been thirtysix of these aerial trucks placed in the more important cities of the country, while the factory at all times is tested to its utmost capacity in the output.