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"I used the Fuller barrel slide rule, designed by Mr fuller of Queens University ,Belfast, N. Ireland to calculate ship stability conditions in the 1940's in the Harland & Wolff Drawing Office , Belfast. The same calculators were used in the same offices on the design of the RMS Olympic & Sister ship Titanic. Since the calculators were the property of the shipyard it is most likely that I used one of the same calculators from that Era, only 30 years later. "