For fixing the film during drying, usually use special clothespins or clips. But if these instruments are at hand does not, they will replace ordinary paper clip.
Recommend to read
P-06 EXPERIMENTAL
In 1935, in the Reactive section of the CA osoaviahima of the USSR designer A. I. Polar was designed and built experimental rocket. Originally it was called "Osoaviakhim" (R-1)....
PETAL COPIER
To get a perfectly accurate joint of the flat parts with a curved surface allows simple reception. Take a sheet of thick paper, such as Whatman; one edge cut into a narrow strip and...
