Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 689
bolt can be passed tohold it between the upright blocks of wood; and at the front endtwo small holes areto be bored so thatthe armature can beriveted to it. A smallblock of wood is cut,as shown in Fig. 30,against which thetwo upright piecesof wood are madefast. This block istwo inches and a half… … 32. DIAGRAM OF A TELE-GRAPH-SOUNDER. ■I an inch thick. At the top of thisblock a brass-headed nail isdriven for the under side of thebar to strike on, a hook andspring are to be attached to therear of the sounder bar, as de-scribed for the key, and at thefront of the base two binding-posts are…
Children's literature
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