For me it was about this time of year in 1976 for a 5th grade science fair I helped run an incubator we had 20 gerber jars and opened up an egg each day and put the contents in one of the jars. the Incubator was just basicly two metal feed pans about 18" wide the bottom one had a flat bottom and a light bulb sticking out the side and ridges so the next tray could sit in it and in the bottom of that tray had hardware wire and a domed plastic top with a vent in it and to adjust the temp you opened or closed the vent so if you wanted to turn up the heat you closed the vent so the heat stayed in the incubator and if you wanted to lower the temp you opened it so the air moved out of it faster. we had to turn the eggs ourselves but I can only remember turning a couple of times a day once when we got to school once at lunch and once just as we were leaving school and way to cool and had a live hatch on the thursday just before going on christmas vacation since the fair was on friday before we had the christmas party
and I haven't seen an incubator like that one since 1976
and I haven't seen an incubator like that one since 1976