Sentence:  When the joint to be roasted is thicker at one end than the other, place the <WSD>spit</WSD> slanting, so that the whole time the thickest part is nearest the fire, and also the thinnest by this means is preserved from being overmuch roasted. 
Meaning of the word marked with <WSD> tags:  A thin metal or wooden rod on which meat is skewered for cooking, often over a fire.