Archive image from page 100 of Design for a brain (1954). Design for a brain . designforbrain00ashb Year: 1954 7/6 TIME-- Figure 7/5/1 : Diagram of the changes in x, volume of urine in the bladder, and y, activity in the centre for micturition, when automatic action has been established after spinal section. '1 ~2 Figure 7/5/2 : Field of the changes shown in Figure 7/5/1, determines a jump from 0 to F. When it is at Y, its critical state is x = Xv y = Y, for the occurrence of this state determines a jump from Y to 0. 7/6. A common, though despised, property of every machine is that it may
Archive image from page 100 of Design for a brain (1954). Design for a brain . designforbrain00ashb Year: 1954 7/6 TIME-- Figure 7/5/1 : Diagram of the changes in x, volume of urine in the bladder, and y, activity in the centre for micturition, when automatic action has been established after spinal section. '1 ~2 Figure 7/5/2 : Field of the changes shown in Figure 7/5/1, determines a jump from 0 to F. When it is at Y, its critical state is x = Xv y = Y, for the occurrence of this state determines a jump from Y to 0. 7/6. A common, though despised, property of every machine is that it may 4 break '. This event is in no sense unnatural, since it must follow the basic laws of physics and chemistry and is therefore predictable from its immediately preceding state. In general, when a machine ' breaks ' the representative point has met some critical state, and the corresponding step-function has changed value. As is well known, almost any machine or physical system will break if its variables are driven far enough away from their usual values. Thus, machines with moving parts, if driven ever faster, will break mechanically ; electrical apparatus, if subjected to ever higher voltages or currents, will break in insulation ; machines made too hot will melt—if made too cold they may encounter other sudden changes, such as the condensation which stops a steam-engine from working below 100° C. ; in chemical dynamics, increasing concentrations may meet saturation, or may cause precipitation of proteins. Although there is no rigorous law, there is nevertheless a wide- 85 G
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