Why was a phone operator automated???

When Technology (the phone systems) became more advanced humans became needed less and less in this process

Explanation:

Automatic, or dial, systems were developed in the 1920s to reduce labor costs as usage increased, and to ensure privacy to the customer. As phone systems became more sophisticated, less direct intervention by the telephone operator was necessary to complete calls. Hope this helps you!

It was automated to reduce labor costs as usage,increased and to ensure privacy to the customer.

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.