By Jim Hrisoulas
This complicated examine of metal finds forging secrets and techniques that for hundreds of years were secure via guilds. Never-before-seen directions, diagrams and images clarify the methods in the back of utilizing jap mokume gane, differential warmth treating, strength hammers, and different thoughts to make kukris, wavy blades, spears and swords that undergo the master's mark.
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Additional info for The Master Bladesmith: Advanced Studies In Steel
Example text
D Á W2Þ þ ðP Á D Á W2Þ We have eliminated half the terms and, of those remaining, they are 25% smaller. Looking at the new logic equation, we can see that by combining the first and second terms (making ‘‘D’’ a don’t care bit in the process) CHAPTER 2 Combinatorial Circuits Table 2-8 45 Testing optimized home alarm logic equation. W2Þ þ ðP Á W2Þ which is, again, the logic equation found by optimizing the function using truth tables or Karnaugh maps. Personally, I tend to optimize logic equations using the Boolean arithmetic laws and rules listed in Table 2-7.
2-1. Table 2-1 Home alarm logic. Home alarm truth table. the windows, door and power are passed to an alarm system. When the alarm system was designed a table of the different possible combinations of inputs was generated (Table 2-1), with the combinations that would cause the alarm to sound indicated. As I have noted in Fig. 2-1, the alarm inputs are positive active, which means I can represent them as being active with a ‘‘1’’. In this fictional house, I assumed that the upper window (‘‘W1’’) should never be opened – if it were opened, then the alarm would sound.
W2Þ þ ðP Á D Á W1 Á W2Þ We can bring out the ‘‘P’’ values from the products and look for similarities in the remaining bracketed values and combine them using the associative, distributive, complementary and AND identity laws. D Á W2Þ þ ðP Á D Á W2Þ We have eliminated half the terms and, of those remaining, they are 25% smaller. Looking at the new logic equation, we can see that by combining the first and second terms (making ‘‘D’’ a don’t care bit in the process) CHAPTER 2 Combinatorial Circuits Table 2-8 45 Testing optimized home alarm logic equation.