Abstract: An intruder alarm system in which intrusion into an enclosed space is detected as a change in the air pressure in the enclosed space uses a microcomputer to monitor the enclosed space by way of a sensor such that changes in air pressure are compared with a reference set at spaced intervals in dependence upon the ambient air pressure, whereby false alarms caused by changes in the weather are avoided.

Abstract: Heat transfer through a pneumatic tire being cured is simulated using a linear or two-dimensional network of resistors and capacitors. Voltages are provided by thermocouples to each end of the network, the quantity of each voltage corresponding to the internal and external temperature of the tire in the curing mold. The temperature at any point within the tire can be determined by tapping off the voltage at the corresponding point along or within the network. This voltage can then be processed to calculate an equivalent cure factor and can also be utilized to open the curing press when a desired curing state is reached at the internal point being monitored. The apparatus in addition to being used in conjunction with an actual tire cure can also be used in the laboratory where voltages can be imposed to represent hypothetical cure temperature conditions.