, ,

version 3

section 1

newspaper ad from 1947

section 2

lightning v1b wm sm

version 1


version 2

section 3

lightning adding machine calculator box v0 wm sm

The elusive connection between the Lightning Calculator and the Lightning Adding Machine.  This box would have contained the early non-clearing version of the Lightning Adding Machine

lightning adding machine box v2a wm sm

version 1a box

lightning adding machine box v1ab wm sm

version 2a box

lightning adding machine box v2 wm sm

version 2 box

section 4

newspaper ad from 1949

section 5bv3

section 5c

section 5c2

section 5d

section 6

Post Script:

Sharp-eyed readers will have noticed that this month’s post was typed on a typewriter.  I wanted to do something a little special for the fourth anniversary of this blog.  My more knowledgeable readers will probably be able to identify what typewriter I used just by the typeface 🙂  Really super sharp-eyed knowledgeable readers will catch that I was forced to use two different typewriters due to a carriage breakdown in my LC Smith & Corona Typewriters Inc Sterling s/n 4A110773.  To the rescue came my Underwood Portable s/n  S1154711 which took over from “Patent and Other Information” on down.