The mood conveyed in the poem is highly effective. Frost's use of dialogue in the middle and towards the end of the poem creates an atmosphere of horror combined with intense pain. While maintaining the third person distinction, the words the boy speaks while immersed in this awful moment creates this feeling of helplessness and terror. When the boy pleads with his sister to not allow the doctor from taking his hand and repeats it, there is a moment of pain combined with terror evoked. The reader fully grasps the physical and emotional pain the boy feels, but there is also this condition of helplessness that the boy is enduring. This is added by Frost's next line: "So. The hand was gone already." The mood created with this moment is one where Frost is able to evoke a feeling of horror in the reader that highlights the tremendous agony of the accident and its impact on the small boy.
In Robert Frost's poem "Out, Out-" Frost uses various types of literary devices, but the most prominent are metaphors. Metaphors are when a word or set of words is used to replace the item. In the poem mentioned Frost uses; "Call it a day" meaning to be done with work; "He must have given the hand" to mean that the boy's hand went into the saw; "The life from spilling", the boy's blood ; "He lay and puffed his lips out with his breath," which is his dying breath; and "No more to build on there", the child's life is over.
Frost could have said things in an ordinary way but he used metaphors which add grace and beauty to his poem.