The 1920 printing of "Applied Mechanical Arithmetic as practiced on the Comptometer" of course also shows the new controlled-key models with improved clearing mechanism. For example, this 10-column standard configuration model H:
In the photograph, the machine's register is set to display 37,639,572,042 - seems to be a random range of numbers.
To check - also when seen entered into an actual 10-column Model H, the numbers seem random.
Most likely 37,639,572,042 is merely to show that the register can contain digits, with no obvious link to any of the many calculations in the book - but still wondering if there's an Easter Egg hidden in there somewhere. (That I'm not yet seeing - anyone?)
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