What is "sibley tent"

The Sibley tent was invented by the American military officer Henry Hopkins Sibley and patented in 1856. Of conical design, it stands about high and in diameter. It can comfortably house about a dozen men.

The Sibley design differed from other conical tents, or bell tents in a number of ways. Sibley's design is supported by a central pole that telescopes down into the supporting tripod so that it takes less space to pack and store. The tripod could be erected over a firepit for cooking and heat. The Sibley design also required no guy ropes, being held down by twenty-four pegs around the base. Additionally, unlike earlier designs, the use of a cowl over the central pole allowed for ventilation and for the escape of smoke, regardless of wind direction.