The candling torch is used to inspect bird eggs in the early stage of nesting. It is used to check if a birds eggs are fertile or not.
The light is placed up against the wall of the egg and the light passes through the eggs shell lighting up its contents.
If the egg is fertile a network of veins is visible inside, if the egg is not fertile the contents will be clear.
Only a yoke will be visible with the candling torch.
The candling torch I use is made out of a piece of garden irrigation pipe for the main shaft.
A high intensity white or clear Led is used to produce the light.
The power supply is a lithium battery switched on and off by a micro switch.
Purpose built candling torches can be purchased online or you could use a small pen light torch.
How To Use A Candling Torch
The candling torch should be used to check the gouldians eggs after the last egg has been laid.
Try to be a bit discreet and not stress the parents out too much when checking the eggs.
Tap gently on the side of the nest box before disturbing the birds if they are inside still.
This gives them a chance to fly out before inspecting the nest box.
Do not check or disturb the parents too often.
This is very important or they may abandon the eggs in the nest box.
The eggs have to be incubated for about five days.
By checking the eggs for fertility saves the birds from having to incubate eggs that are not fertile.
They can then focus on the fertile eggs until they hatch.