For decades, teachers drilled American school children using flash cards that gave simple arithmetic problems.
History Explorer Results (1)
Related Books (0)
Grade Range:
K-12
Resource Type(s):
Artifacts, Primary Sources
Date Posted:
7/9/2009
This early respirator for producing artificial respiration over long periods of time was designed and constructed by the donor, John Haven Emerson. Completed in July 1931, it was first used in the summer of that year at the Providence City Hospital, Providence, R.I...
