This is a partial close-up of the approximate bottom left corner of the
Science & Technology Wall Chart.
The image represents about 8% of the
This close-up covers a period from approximately 1100 AD to 1740 AD, and
depicts 5 of the 15 categories.
From bottom to top, the categories are: Architecture
& Construction, Computing & Tabulating,
Transportation, Time &
Measurement, and Other Sciences.
Also depicted is part of the alphabetized cross-reference table of events
(white box, bottom right corner of
this image), and part of the category table
(multi-colored box at bottom left corner of this image).