The incubator

My paraffin egg incubator was already a museum piece when I acquired it nearly 40 years ago. I used it when I was a poultry keeper but it has been unused for more than 30 years, for much of that time occupying space in my coal shed which is now, rather more a log store.

It has just been brought to the surface and dusted off ready for a starring role in somebody else’s life story. It is a fab bit of kit which solved the problems of egg incubation in a simple but effective way, using a paraffin burner as the warmth source. Let’s see this item outside on a bright sunny day.

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So how can a simple paraffin stove maintain a steady temperature of 103o Fahrenheit for hens eggs, be adjusted to 102o for duck eggs or about 99.5o for goose eggs. The answer is simple and all depends on the capsule which is this little chap below.

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This item sits on a shelf high up in the incubator the gas in the blob in the middle expands and pushes the metal outwards. A rod rests on the capsule and passes through a tube and out of the top of the incubator.

Here it can push the weighted bar up and down. Adjustments can be made by altering the screw or by moving the weight on that horizontal bar. At the end of that bar a lid hangs over the heater.

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If the capsule thinks the incubator is cold the rod is slightly lowered and the lid shuts over the heater which diverts heat and combustion products into the incubator. As it warms, the lid rises and heat just escapes into the air. Amazingly, it works well and it can be checked by reading off the thermometer which hangs in the incubator.

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This thermometer – and the whole incubator – was made by the Gloucester Incubator co ltd of Woodchester which is near Stroud.

This particular model is the Gloucester Junior.

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And there we see the closures that give access to the inside for turning eggs and filling water trays.

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Now as an extra, when we got this incubator we popped into our local Ministry of Agriculture Office to see if there was any information on how to use it. Yes, they had one which included this picture.

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It looks remarkably familiar!

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