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The use of a regular array. or lattice, of magnetic bubbles for the storage of information requires two kinds of functions: the read-write functions involving the generation and discrimination of bubbles with different wall structures, and the access functions involving the insertion and removal of bubbles at selected locations in the lattice. In a column-accessed bubble lattice device, accessing is accomplished by first translating the lattice to position the desired column of bubbles in an input-output access channel and then translating this column along the channel to a detector area outside of the lattice while simultaneously introducing new bubbles from a generator area at the other end of the channel. An analysis of the influence of device design parameters on access rate indicates that the most important parameters are the column translation rate and lattice capacity. A device is described that was designed to study the translation of a lattice of bubbles and of a single column of bubbles within the lattice. Quasistatic operating margins and dynamic measurements of this test device indicate that the column-access configuration provides feasible means for the rapid access of bubbles from a lattice. Table 1 Bubble diameter and feature size required for a storage density of 105bits!mm 2 •

To led0 , Ohio for Controlled DEvacuation), developed by The KIMCODE system (KImble Method the Kimble Glass Company, has introduced the television tube industry to n new concept. The KIMCODE system is designed to prequire the use of glass or plastic shields. The sys-vent and contain implosions, and does not retem involves reinforcing glass envelopes with steel bands, glass fiber cloths, and plastic resins. This new approach offers many advantages, including lower weight and new styling. A de-Underwriters' Labordtories requirements, scription of construction, performance results, will be presented. means of devacuation, and application features 45.5. Some Achievements and Limitations of Educational Television

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