Sentence:  For long distance messages, reports, etc., the use of the <WSD>printer</WSD> telegraph renders a highly satisfactory and efficient service, especially where the line circuits are derived through a composite or phantom circuit without the exclusive use of wires for this circuit. The Union Pacific recently installed a two-channel multiplex automatic <WSD>printer</WSD> on a simplexed circuit, thereby eliminating the necessity for at least one additional overland wire, and also speeding up the service and reducing the cost for each message. 
Meaning of the word marked with <WSD> tags:  A device, usually attached to a computer, used to print text or images onto paper; an analogous device capable of producing three-dimensional objects.