To See Through Paper.

Kaipara and Waitemata Echo, 22 May 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 German in aniold number of the "Mechanics' Magazine" of the year 1829. Take a piece of paper of such thickness that, when it is laid upon a piece of printed matter, the characters just 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 will find that now you can read the print below the paper. It is rather difficult lq explain this peculiar effect. The explanation offered is that the paper has a number of thin places in it, and by rapidly moving- it over the print, every part of the printed matter is exposed in turn underneath one or the other of the' thin places., ki 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 meana

imaginable