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Good sleuthing. Notice the word, "about." Notice, too, other, missing scientific aspects of the "gadget." Ex: the Urchin (L. Slotin inserted), etc.
The scientists used kilograms for the weights, so 6.2 kg = 13.7 lbs. It is, as it notes, not meant to be a totally formal scientific or military report, just a quickly-written description that was meant for Stimson and Truman to use to make sense of the new weapon.
Can you shed more light on the decision to do bomb work in kg rather than another measurement? Relevant for a related project I'm working on
They are scientists and were producing fissile material in gram quantities? I don't know if there is more of a reason than that. Scientists had switched to SI units a long time before WWII.
Fascinating. And shows that he didn't realize that not all of the Pu fissioned.
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