National Geographic : 1912 May
The Tree System-The Bell System A NOBLE tree thrives because the leaves, twigs, branches, trunk and roots are all working together, each doing its part so that all may live. Neither the roots nor the branches can live without the other, and if the trunk is girdled so that the sap cannot flow, the whole tree dies. The existence of the tree depends not only on the activity of all the parts, but upon their being always connected to gether in the "tree system." This is true also of that wonderful combination of wires, switchboards, telephones, employes and subscribers which helps make up what is called the Bell Telephone System. It is more than the vast machinery of communication, covering the country from ocean to ocean. Every part is alive, and each gives additional useful ness to every other part. The value of telephone service de pends not only on the number of tele phones, but upon their being always connected together, as in the Bell System. AMERICAN TELEPHONE AND TELEGRAPH COMPANY AND ASSOCIATED COMPANIES One Policy One System Universal erVice "Mention the Geographic-It identifies you."