Quantitation in tissue near infra-red spectroscopy

A roasting oven having means for supporting a rotisserie spit for rotary movement within the oven cavity. One wall of the oven supports a gear motor having an output shaft with a first spit connector or chuck which is adapted to be coupled with one end of a standard spit to create a constant speed turning action spit. An alternate spit carrying a food basket is adapted to be coupled with a second spit connector that is freely supported on the first spit connector. An intermittent drive gear train is connected between the output shaft and the second spit connector whereby this second connector and hence the food basket has a slow, intermittent turning action for exposing first one side and then the opposite side of the food in the basket to a radiant heating source.