Abstract: In an apparatus for detecting the level of fuel oil in a tank of a vessel to control the quantity of fuel oil in the tank, a sensing pipe having a sensing hole in its lower portion is inserted into the tank and gas is continuously supplied into the sensing pipe. Hence, the pressure in the sensing pipe is continuously increased as the level of fuel oil is raised above the level of the sensing hole. When this pressure reaches a desired value, a fluid pressure response device connected to the sensing pipe is operated by the pressure to operate an alarm device, thereby to detect the level of fuel oil above the sensing hole. The pressure in the sensing pipe required to operate the alarm device can be set to a desired value.

Abstract: An ink feeding apparatus used for an offset printing press being adapted to provide simultaneous ink agitation substantially along the entire length of the ink supply line so that ink can be fed little by little continuously in operation as soon as it starts, thereby enabling the smooth feeding of ink for the next operation and to prevent droplet falling of ink.