For those who don't know about slide rules---they are mechanical, analog computers, but they are only good to 3 significant digits, and you had to estimate the third significant digit. That is the purpose of the magnifying lens with the line scribed onto it.

What I heard that I never heard before was that the gimballing of those 5 Saturn engines, and the effect they had on the booster could be felt way up in the capsule. They had to keep that tall booster on trajectory. One of the astronauts remarked that he feared hitting the launch gantry, the movement felt so great.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags