For fastening the sheet with a picture or drawing usually use a pushpin. However, they leave holes both on paper and on the basis, on which is a leaf. Better for the same purpose to use sticky tape, such as Scotch.
Recommend to read
ORBITAL? YES, BUT THE EARTH
a LITTLE SENSATION. "After the invention was patented not only in Australia but also abroad, the curtain of secrecy that until recently hid work Ralph Sarich several parted. The look of...
THE KEY TO THE LOCK — UP RESISTOR
In the fourth issue of the journal for the year 1978, published schemes of electric locks with a "secret". They all work well, but they, in my opinion, there is one drawback: the locks...
