Method of Application
Connect OB-220V ovoscope to the power source. Take the ovoscope in one hand, placing it with the lamp vertically upwards; insert an egg into the light-protection ring of the ovoscope with the other hand. To provide a good visibility, there must not be a gap between the ring and the egg. Turn on the lamp and inspect the egg.
With the electric lamp switched on, the operating time is no more than 10 minutes. To switch it on again, let OB-220V ovoscope cool down by powering it off for 10 minutes.
Note the integrity of the eggshell. Cracks and holes in the shell will be seen as bright stripes and points. The air chamber should be on the blunt end of the egg as a darkish round spot and should be immovable when the egg is turned over. The yolk can slowly move inside the egg but should not touch the shell. The contents of a fresh egg suitable for incubation is not dark and almost transparent, with the yolk is less visible than that of an old egg. Eggs unsuitable for incubation are as follows:
— very dirty eggs of irregular shape;
— eggs having defects of shell (cracks, thin shell, large number of large chalky barnacles);
— two-yolk eggs;
— eggs with displaced or wandering air chamber;
— eggs in which the egg white mixed with the yolk as a result of breakage of the yolk membrane;
— eggs in which the white or the yolk are stained with blood;
— eggs affected by mildew, having opaque or dark spots, with inclusions of blood or other foreign bodies;
— old eggs which were stored for a long time (upon screening such eggs, it is possible to see the swollen air chamber; the yolk is large, dark, is near the shell or got stuck to it, the boundaries are sharper than in a fresh egg; the white is liquid, so the yolk is highly movable).
In case the lamp has gone out, it should be replaced as follows (for OB-220V ovoscope, a mignon lamp of 25 W power is required):
— remove the light-protective ring out of the housing (for that, remove the two screws);
— press the lamp with the fingers while rotating it anticlockwise by 1/8 of a turn, and remove the lamp out of the socket (unscrew the lamp out of the socket and screw in a new one); and
— insert the new lamp into the socket, press, and turn it clockwise until it stops.