Abstract: A method and a device for determining the amount of ink or similar liquid existing in a container are disclosed. A resonance circuit is arranged on the container storing the liquid. A voltage having a preselected frequency is applied to a drive coil located outside of the container to thereby induce a voltage having a preselected frequency in the resonance circuit. The voltage induced in the resonance circuit, in turn, induces a voltage having a preselected frequency in a sense coil also located outside of the container. The amount of liquid in the container is determined in terms of the voltage induced in the sense coil.

Abstract: An automatic control system for an offset printing machine includes a process execution instructions generating circuit having latched therein instructions for executing various operation processes and adapted to shift from one operation phase to another for successively generating process execution instructions, so that an ink forming and master plate feeding process, an inking process, a transfer-printing process, a printing process, and a master plate ejecting and cleaning process can be automatically executed in correct order. The number of times for executing each of the etching, inking, transfer-printing and cleaning processes can be adjusted in a process setting structure. When a master plate feeding error detecting signal is generated, the process execution instructions generating circuit is reset to an initial condition of stop instructions which prevailed prior to actuation of a start switch.

Abstract: Fluorescent dyes having the formula ##STR1## wherein R.sup.1 represents hydrogen, (C.sub.1 -C.sub.8) alkyl, trifluoromethyl, (C.sub.1 -C.sub.4) alkoxycarbonyl, (C.sub.1 -C.sub.4) alkoxycarbonyl (C.sub.1 -C.sub.4) alkyl, phenyl, or aralkyl group; R.sup.2 represents hydrogen, cyano, acyl, (C.sub.1 -C.sub.8) alkoxycarbonyl, (C.sub.1 -C.sub.4) alkoxy (C.sub.1 -C.sub.4) alkoxycarbonyl, (C.sub.1 -C.sub.4) alkoxy (C.sub.1 -C.sub.4) alkoxy (C.sub.1 -C.sub.4) alkoxycarbonyl, di(C.sub.1 -C.sub.4) alkylamino (C.sub.1 -C.sub.4) alkoxycarbonyl, cyclohexyloxycarbonyl, aryloxycarbonyl, benzyloxycarbonyl, tetrahydrofurfuryloxycarbonyl, carbamoyl, N-(C.sub.1 -C.sub.4) alkylcarbamoyl, N,N-di(C.sub.1 -C.sub.4)alkylcarbamoyl, N-phenylcarbamoyl, or morpholinocarbonyl group; and R.sup.3 and R.sup.4 can be the same or different and each represents hydrogen, (C.sub.1 -C.sub.8) alkyl, (C.sub.1 -C.sub.4) alkoxy(C.sub.1 -C.sub.4) alkyl, aralkyl or phenyl group which can be substituted by halogen atoms, (C.sub.1 -C.sub.

Abstract: A novel cyanotriphenodioxazine compound is disclosed which is represented by the following formula: ##STR1## wherein X represents cyano or halogen, R.sup.1 represents C.sub.1 -C.sub.4 alkylene and R.sup.2 represents C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkyl and is a dyestuff suitable for dyeing synthetic fibers or cellulose acetate fibers in brilliant red shade with good fastness to light and to sublimation.