. Bell telephone magazine . -mented in some cases by a bi-weeklyaddress addendum, but was reprintedonly as frequently as the customer di-rectory. This arrangement of recordsadversely affected the time intervalinvolved in locating telephone listings,because operators frequently found it necessary to consult one or more oftheir addenda records to obtain theinformation desired. This was par-ticularly true with increasing obsoles-cence of the customers directory. Inone large city it was found that forevery 1,000 calls handled, the opera-tors were obliged to consult over 1,800records under this pla
. Bell telephone magazine . -mented in some cases by a bi-weeklyaddress addendum, but was reprintedonly as frequently as the customer di-rectory. This arrangement of recordsadversely affected the time intervalinvolved in locating telephone listings,because operators frequently found it necessary to consult one or more oftheir addenda records to obtain theinformation desired. This was par-ticularly true with increasing obsoles-cence of the customers directory. Inone large city it was found that forevery 1,000 calls handled, the opera-tors were obliged to consult over 1,800records under this plan, while withfrequently reprinted records this num-ber was reduced to less than 1,300. Use of Rotary Files HoTARY file records, both alphabeti-cal and street address, differ fromfrequently reprinted records chieflyin that they are contained in rotaryfiles instead of books, and in themethod of maintenance. The rotaryfile consists of a stand on which rotat-ing drums are mounted, and fastened 156 Bell Telephone Magazine AUGUST. An Information Position The operator is using one of fhe frequently reprinted rerords provided for her indiridunl use. In the racks are current directories for other frequently called localities, which are also ivithiti reach of operators at adjacent and opposite positions in segments of these drums are frameswhich carry the listings. The standmay have one or two drums, givingeither a one-tier or two-tier rotaryRotary files are placed on the switch-board in a manner which makes themeasily accessible to the operators whouse them. When an order is receivedfor the connection of a new telephone,inserts containing the new customerslisting are prepared by the clericalforce at the Information advice is received that the tele-phone has been installed, these in- serts are placed in their proper posi-tions among the other listings in eachof the rotary files. When a telephoneis disconnected, the inserts showingthe listing of the customer involvedare remove
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