To See Through Paper.

Kaipara and Waitemata Echo, 14 August 1914, Page 2

To See Through Paper.

A very remarkable experiment which any one can repeat with very little trouble has been unearthed by a contributor to "Prometheus," in an old number of the "Mechanics' Magazine" of the year 1829. Take a piecje- of paper of such thickness that, when it is laid upon a piece of printed matter, the characters must show through, but cannot be read. Placing it over a printed sheet, impart to it a circular motion to and fro, and to your surprise you wi-11 find that now you can read the print below the paper. It is rather difficult to explain this peculiar effect. The expJana-tion offered in "Prometheus" is that the paper has a number of thin places in it, and by rapidly moving it over the print, every ptirt of the printed matter is exposed in turn beneath one or the other of the thin places in the paper and thus the entire print can be read. However that may be, the experiment is interesting and very simple, requiring for its performance only the simplest means imaginable.