Before Powerpoint (or personal computers) existed, presentations were given using lantern slides and a special projector. Lantern slides were the first method invented to easily make a photograph visible to a large audience. Patented in 1850, they continued to be used through the 1950s, and thereafter were still used in a reduced-size format at academic institutions until 35mm film became the lowest-cost option.
These slides were used by Dr. Albert Kapikian to present virology research performed in his Building 7 laboratory in the 1970s. Along with other NIAID investigators, Dr. Kapikian participated in virus identification studies using samples obtained from a group home for neglected children, and was able to isolate the virus causing para-influenza from these samples. These data, along with data on the effectiveness of measles vaccine, are preserved in the slides above.