Abstract: A spreader device includes a container to contain spread substance, a first spreader portion having a first rotor to spray the spread substance contained in the container, a second spreader portion having a second rotor to spray the spread substance contained in the container, a first driver source to drive the first rotor, a first shaft to transmit a driving force outputted from the first driver source, a second shaft to transmit a driving force outputted from a second driver source different from the first driver source, and a selection transmitter portion to selectively transmit the driving force form the first shaft and the driving force from the second shaft to the first rotor or the second rotor.

Abstract: A circuit for measuring a carrier-to-noise ratio or a bit error rate of demodulated I and Q digital signals obtained by demodulating an input carrier wave which is modulated and transmitted under a carrier modulation transmission system including a discriminating circuit for producing a discrimination signal each time the demodulated digital signal comes within predetermined windows set on a signal space of the I and Q signals, a counter for counting the discrimination signals during a predetermined time interval, and a calculating circuit for calculating a carrier-to-noise ratio or bit error rate in accordance with a count value with reference to a previously stored relationship between count values and carrier-to-noise ratios or bit error rates.

Abstract: A process for preparing a dialdehyde which comprises subjecting a glycol to oxidation-dehydrogenation in the presence of silver particles of which the surface is partially coated with a silicon carbide powder or a silicon nitride powder. According to the present invention, dialdehydes can be prepared from glycols in high conversion of the glycol in high selectivity into the dialdehyde, and the silver catalyst can be reused even if the reaction is stopped in a while since the silver particles are not aggregated during long time operation.

Abstract: A three-dimensional image display system comprising a video information memory, storing video information in the form of a perspective view, a reading circuit for reading out the video information stored in the video information memory while scrolling the stored video information in an oblique direction with respect to the perspective view, and a display for displaying in perspective the read out video information in such a way that the displayed picture is obliquely scrolled as time elapses.

Abstract: An emulsifier useful for preparing an aqueous emulsion having a high viscosity which comprises a copolymer of (1) at least one monomer selected from a vinyl ester, vinyl alcohol, an alkyl acrylate and an alkyl methacrylate and (2) at least one monomer selected from an acrylic acid derivative of the general formula:CH.sub.2 .dbd.CR.sup.1 --CO--A--R.sup.2 --SO.sub.3 Mand a maleic acid derivative of the general formula: ##STR1## wherein R.sup.1 is hydrogen or methyl group, R.sup.2 is an alkylene group, R.sup.3 is hydrogen, an alkyl group or an alkali metal, M is hydrogen or an alkali metal, and A is --O-- or --NR-- in which R is hydrogen, an alkyl group or --R.sup.2 SO.sub.3 M. Emulsions prepared by employing the above copolymer as emulsifier have very high viscosities and moreover excellent storage, freeze-thaw and dilution stabilities.

Abstract: A combustion control circuit including semiconductor integrated circuits used for control of a combustor or burner of a water heater, air heater-blower or the like has a very simple configuration for stable initialization against the transient condition of a source voltage. A logic gate performs a sequence control. An input interface section applies a signal to the logic gate in response to an input signal required for combustion control. An output interface section converts the signal produced from the logic gate into a combustion control signal. An operation start signal from an operation switch or a temperature detector circuit is used in combination with an initialization signal for the combustion control circuit.

Abstract: A combustion control apparatus in which a predetermined number of pre-purge and igniting cycles are repeated until ignition takes place successfully. A pre-purge time interval of the second and subsequent igniting cycles is selected shorter than that of the first igniting cycle. When an existing combustion control element which is capable of performing the igniting cycle only once is employed, the intended combustion control is performed by appropriately controlling a reset terminal of the existing combustion control element of signals representative of expirations of the pre-purge time interval and the ignition time interval. The number of the igniting cycles is counted by a counter for stopping operation of the combustion apparatus when a predetermined count value is attained. A novel circuit for the combustion control element is also disclosed.

Abstract: A combustion control apparatus which controls combustion in a combustor which is a heat source of a hot-water boiler or a hot-air heater includes a memory circuit which generates an alarm signal and also a signal for stopping the operation of the apparatus and which maintains the apparatus in the shutdown state, when an abnormal condition such as abnormal heating or ignition failure is sensed. This memory circuit is protected from malfunction due to noise generated from external output units in the combustion control apparatus by a circuit which detects an abnormality signal with timing other than the timing of generation of noise from the external output units, and the output of this circuit is applied as an input to the memory circuit. The detection circuit is arranged to detect the abnormality signal while receiving clock pulses from a timer as its input, and the phase of its detection timing is selected to be out of phase with the noise generation.

Abstract: This invention relates to a control circuit which controls combustion in a burner acting as a heat source of a hot-water boiler or a hot-air heater. More particularly, the present invention relates to a control circuit having a sequence which includes post-discharge such that electric discharge for ignition is still continued for a predetermined period of time, even after attainment of ignition. In a combustion control apparatus, when ignition is not attained within a predetermined safty period, the igniting operation is stopped by a safty timer for timing this safety period, thereby ensuring the safety. It is necessary to reliably discontinue the igniting operatin even when this safety timer is disabled. The present invention attains this object and ensures the safety with a reduced number of timers.

Abstract: A check circuit for checking operation of timers of a digital type combustion process control apparatus comprises flip-flops each having a preset terminal. The preset state of the flip-flops is inverted by an operation starting signal. The inversion is detected by a detector circuit the output signal of which is utilized for driving the control circuits for a combustion apparatus. The detector circuit is composed of a flip-flop circuit having input terminals applied with the operation initiating signal and the inverted output signal from the timer circuit.

Abstract: Disclosed is a combustion control apparatus of digital type, in which a fault is warned of unless ignition resumes in a predetermined time after the start of igniting operation in the reignition when fuel flaming is extinguished during combustion. The predetermined time is called safety time and the combustion control apparatus can exactly obtain such a required time or period as the safety time. With such a digital type combustion control apparatus, the safety timer for establishing the safety time comprises flip-flops adapted to count reference clock pulses. In this apparatus, the circuit for generating the reference clock pulses is set and reset by the flame extinction signal to synchronize the clock pulses and the flame extinction signal so that the safety time may be free from error. This concept can be applied to determine the prepurge time.

Abstract: A combustion control system applicable universally to various types of combustion apparatus operating with different control timing and different fuel is disclosed. The combustion control system includes a data selector circuit, a control circuit, and a control timer circuit using a counter as timing means. The data selector circuit includes a circuit section for providing pre-purge timing and another circuit section for providing ignition timing as required. The control circuit includes an R-S flip-flop controlled by the pre-purge timing produced by the data selector circuit section.