g shown in Fig. 45. The center a hole to receive the fastening bolt, and a counter- cone pulley, A, is bored to fit the mandrel, B, tightly, and sink or recess to receive the nut and prevent it unscrewing. secured at the end to receive the light brass bush, C, which E represents a hinged plate, and… … its pivoted end. A slot for the fastening bolt to pass through is provided in the plate, E. In this arrangement, a very mo- derate amount of force applied to bring up the cam lever will cause the plate, D, to be pressed down, carrying with it the nut. This arrangement is simple, cheap, durable, and…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-1027-654.webp)
