I just bought a Leahy Favorite 426 and can't figure out how the web bulb works. It has two thermomoters, which I believe are for heat temperature. And in the middle of them is a small glass tube with a little cup at the bottom, which I assume is for the wick. Does anyone know if I am supposed to have some type of thermometer behind or next to this as well? Or how it works? I have a copy of the manual but can't quite understand how it works. It says to Place mouth of glass tube 1/2 inch from bulb of wet bulb themometer. Is this a separate thermometer, that is perhaps missing? Then: immerse tube, holding it in a horizontal postion; slowly lower one end nd then the other until is is full. Refill whenever necessary. I assume I do this before I put it in the bator? Also with the trays I have 4 with egg positioner, one just flat and on with metal slats that go horizontally, are these for laying eggs flat?