One budgie egg is incubated

Of the 3 eggs laid, 1 were at the bottom of the cage broken, 1 was taken out from the next box and was broken also, 1 left dashed at the corner of the next box which was transferred then to a home-made incubator.
This incubator was made from an old ice box-installed with a digital thermometer, with a CPU fan powered by a 6 DC voltage which is paralleled to the 6 volts spot (halogen) light. A glass of water was also put inside the ice box to provide humidity anyway. I don't have an instrument to measure the humidity as of now. The temperature read only 35.6 degree Celsius, so I put the adaptor of the spotlight inside the box to increase the temperature since it also emits heat. Only then I got the perfect temperature of 36.8 degrees.
Again this is just an experiment.

Another broken budgie egg

Yesterday night I changed and transferred the couple budgies to a separate cage. I had prepared a better recessed bottom nest box. The 2 eggs where transferred without the sight of the birds since I turned the lights, and uses a leaf to touch and transfer the the eggs.
This afternoon, I saw another egg broken and empty at the bottom of the cage. I'm not sure whether  it's the 2nd egg or the 4th egg that was broken since I hadn't checked yet the numbers of eggs inside the box. It could be the 2nd or the 3rd egg that which empty shell was taken out by the hen.