| 21. | Velasco eventually traded his slide rule and graph paper for needle and thread.
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| 22. | There are seven windows with slide rule and four roof airshafts.
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| 23. | :Upload the image with the slide rule vertical, rather than horizontal.
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| 24. | Specialized slide rules were invented for various forms of engineering, business and banking.
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| 25. | He made the slide rule he used during all his academic years in Ljubljana.
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| 26. | It almost feels as if the slide rule has returned.
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| 27. | OK, now put away the slide rules and pocket calculators.
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| 28. | And all members are given a simple pocket slide rule that calculates the points.
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| 29. | He got his slide rule out and did some figuring.
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| 30. | We had to get by with a damn slide rule!
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