Abstract: An indicating recorder comprising a housing unit, an internal frame unit and an electric power source unit. The housing unit includes a single-swing front door and is made from a square prismatic housing formed by bending a thin plate. The internal frame unit is positioned in the vicinity of the inlet of the housing unit and is rotatable in a direction opposite the front door so as to be drawn out toward the front. The internal frame unit has left and right side plates and coupling beams between the two side plates, and principally comprises an indicating recorder mechanism having a chart feed mechanism, a recording pen mechanism, and other related instruments.The electric power source unit is located in the housing unit and is equipped with a power transformer and a terminal board unit, both of which are in a rear frame region to provide power supply and input signals.

Abstract: A simplified, compact, inexpensive portable self-balancing recorder to be used in the monitoring of data relating to pollution and/or environmental protection. The recorder is about 650 cubic centimeters in volume and weighs about 5 kilograms; it comprises a minimal number of constitutent components and may be operated without certain costly options (e.g. alarms and controls) if desired. The recorder uses printed circuit board circuitry to monitor and process input signals from the measuring points, and these components can conveniently and easily be removed from the recorder for adjustments or replacements. The recorder includes means for adjusting the ink pressure according to recording conditions and provides an inking system with an hermetically sealed pen point to prevent introduction of bubbles into the ink.

Abstract: A multipoint recorder of the type used to monitor a number of measuring instruments and including a mechanism having a group of contacts for sequentially selecting signals from a number of measuring points, a self-balancing circuit having a balancing motor for intermittently measuring each of said signals, and an indicating and recording mechanism operated in synchronism with said selection mechanism for indicating and recording, e.g., on a strip chart, the group of measurements supplied by said self-balancing circuit. The multipoint recorder is characterized by a group of auxiliary contacts in said selection mechanism interspersed with the group of measuring point selection contacts, said auxiliary contacts being switched with a given delay behind switching of the measuring point selection contacts so that the auxiliary contacts are sequentially closed as the selection mechanism switches between measuring point selection contacts.