Abstract: Low-pressure fire-extinguishing liquid is converted into mist. A fire-extinguishing spray nozzle (10) comprises a main body (30) and an obstacle (36). The main body (30) has a port (40) for radially injecting the fire-extinguishing liquid. The obstacle (36) has an opposing surface (60) and is opposite to the port (40). The opposing surface (60) is arranged within a radial-injection region (102) of the fire-extinguishing liquid radially injected from the port (40). One part of the fire-extinguishing liquid radially injected from the port (40) collides with the opposing surface (60) and is reflected therefrom. The other part of the fire-extinguishing liquid radially injected from the port (40) passes around the opposing surface (60). The one part of the fire-extinguishing liquid is reflected from the opposing surface (60) and the other part passes around the opposing surface (60).

Abstract: Low-pressure fire-extinguishing liquid is converted into mist. A fire-extinguishing spray nozzle (10) comprises a main body (30) and an obstacle (36). The main body (30) has a port (40) for radially injecting the fire-extinguishing liquid. The obstacle (36) is arranged within a radial injection region (102) of the fire-extinguishing liquid radially injected from the port (40). The obstacle (36) has an outer peripheral surface formed in the shape of a truncated-conical inclined surface (62). This enables the fire-extinguishing liquid (70) radially injected from the port (40) and passing around the obstacle (36) to collide with the fire-extinguishing liquid (72) radially injected from the port (40) and reflected from the inclined surface (62) so as to produce mist (74) of fire-extinguishing liquid. When producing the mist (74) by such an action, the fire-extinguishing liquid radially injected from the port (40) may have a low pressure.

Abstract: To enable a user to perform a hypothetical simulation of the use of firefighting equipment so as to be able to experience operation of such firefighting equipment without using actual firefighting equipment, a manual provision system includes an information terminal device, and a server in which manual information pertaining to an article is recorded, the information terminal device and the server connected to each other through a network, the manual information for the article being scanned into the information terminal device from the server through the network so as to allow the manual information to be checked using the information terminal device. The article is a piece of firefighting equipment and the manual information is a hypothetical operation simulation for the firefighting equipment so as to enable learning the manual information by using the information terminal device to operate the hypothetical operation simulation.