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
THE PLANE OF THE TRANSITION PERIOD
The period between the two world wars represents a considerable interest to historians of technology, and first equipment of aviation. The aircraft of this time, the construction of...
SWITCH WITH PROTECTION
In many technical constructions, devices, in laboratory and bench equipment, automobiles used a DC electrical supply voltage of 12 V overload protection, which can lead to spontaneous...
