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1 The Section on Publications, Mayo Clinic, and the Museum of Hygiene and Medicine, Mayo Foundation, Rochester, Minn.
PHYSICIANS commonly complain that many of the characters projected from stereopticon slides at medical meetings are too small to be read. One physician had been sufficiently annoyed by illegible projections to suggest that an exhibit be prepared to demonstrate the causes of, and the remedy for, the difficulty. This was done.
The main parts of the exhibit were two frames (Figs. 1 and 2). Figure 1 was intended to demonstrate that, as the number of characters in the copy becomes smaller, each projected character becomes larger and thus more legible.
Figure 2 was planned to help the speaker who might object: "True. But what I have to present takes a lot of characters; what can I do about that?" Herein figure 2 is broken down to the essentials of the four panels of which the frame was composed.
A subsidiary part of the exhibit had to do with what might be dignified as the related forensics. It occupied the two wings of the booth. On one wing appeared the jingle:
He never was heard
And never was seen,
Who turned in the dark
And read from the screen.
On the other wing, the corresponding rhyme read:
His audience yawned,
It squirmed and it sighed;
He constantly put
Too much on a slide.
It may be helpful to add that a detailed table, suitable for publication, may be unsuitable for a slide. Slides are exhibits, and one principle of exhibiting is to eliminate all possible reading matter.
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