Abstract: A method and system for updating a digitized map. An operator-controlled vehicle provided with an onboard computer and a navigational transmitter unit is dispatched to a location provided on the map near to an unknown location. The vehicle would then traverse the segment between the known intersection and an unknown intersection while it is being tracked by the navigational tracking unit. When the unit reaches the unknown intersection, the address range as well as the street names of the intersection are verbally inputted into the system. The information collected by the computer is then inputted to the central computer which edits this information and updates its central file to produce a new updated version of the digital map.

Abstract: A method for accurately displaying positional information of a map. A street or terrain map is produced and then digitized. The actual location of various antenna monuments is determined and a coordinate grid map is produced. A table of positional data is created using information derived from calculating the position of each of the antenna monuments utilizing a navigational tracking system, such as the LORAN-C system. Positional information received from various vehicles and the antenna monuments is used to calculate correctional factors used to distort and skew the grid lines constructed from said table of positional data in such a manner that the exact position of a vehicle can be displayed on the street or terrain map.

Abstract: A method and apparatus for positively indicating the position of a land-based vehicle, a marine vessel or an aircraft, utilizing a security system provided in the secured mode of transportation monitored by a central station. Navigational information transmitted by LORAN-C transmitters or satellite transmitters are received and then retransmitted to the central station which determines the exact latitude/longitude coordinates of the secured mode of transportation. The secured mode of transportation also includes a security panel for monitoring the condition of various parameters. An interface is connected to the security panel and the navigational receiver for coordinating the transmission of information relating to the conditions monitored by the security panel as well as the information received by the navigational receiver before they are sent to a radio for transmission to the central station.

Abstract: Silver is recovered from used film plates by passing them into a solution into which their silver material is dissolved and by electroplating the dissolved silver out of the solution. Electrical circuits are provided to increase the magnitude of a continuous plating current in proportion to the rate of film and silver input and to decrease the current gradually to coincide with the decrease in silver concentration as plating continues.

Abstract: Electrical current used in electrolytic recovery of metals, such as silver, is controlled digitally by causing pulses from an oscillator operating at a first frequency to be counted during introduction of silver bearing salts into solution and causing the electroplating current to correspond to the cumulative count. Thereafter, following salt introduction, the oscillator is operated at a second frequency, corresponding to the previously accumulated count, and the counter is counted down at this second frequency while the electroplating current is correspondingly reduced.

Abstract: Portable apparatus is disclosed for recovering metal from metal bearing solutions. The apparatus includes a chamber arranged to be mounted on a container for the solution to establish a fluid flow path between an anode and cathode in the chamber for deposition of metal on the cathode, the unit being arranged to prevent unauthorized removal of deposited metal from the cathode.

Abstract: Silver is recovered from used film plates by passing them into a solution into which their silver material is dissolved and by electroplating the dissolved silver out of the solution. Electrical circuits are provided to increase the magnitude of a continuous plating current in proportion to the rate of film and silver input and to decrease the current gradually to coincide with the decrease in silver concentration as plating continues.