At either one of the two recorders (Fig. 1), information comes out of the machine, either in the form of printed characters or as punched tape. The recorder consists of a _printer_, a _reperforator_, and a tape transmitter. One recorder table belongs to each computer and records the results it computes. The printer is a regular teletypewriter connected to the machine. It translates information produced by the machine as electrical impulses and prints the information in letters and digits on paper. The reperforator is an automatic tape punch. It translates information produced by the machine in the form of electrical impulses and punches the information on paper tape. Next to the tape punch is a tape transmitter. After the tape comes through the punch, it is fed into the transmitter. Here the machine can hunt for a previous result punched in the tape, read that result, and use it again. HOW INFORMATION IS MANIPULATED IN THE MACHINE The main part of the computing system consists of 27 large frames loaded with relays and wiring, called the _computer_, or _Computer 1_ and _Computer 2_. In this “telephone central station,” all the “phone calls” from one number to another are attended to. There are 8 types of these frames in the computer: FRAMES NUMBER Storing register frames 6 Printer frames 2 Problem frames 2 Position frames 2 Calculator frames 6 Control frames 2 Routine frames 4 BTL (Block-Trig-Log) frames 2 Permanent table frames 1 —— Total 27