Compact arrangements of two-input magnetic bubble logic gates providing bubble devices for performing serial integer arithmetic on binary integers are disclosed. Using only a small number of different types of logic gates, designs are given for devices for performing serial addition, subtraction, multiplication and division arithmetic operations on binary integers, represented as sequences of magnetic bubbles. All logical interactions use bubble repulsion to prevent bubbles from transferring to adjacent propagation paths via preferred transitions. By using only two-input gates and a pipeline computational structure, hardware design is simplified and advantage is taken of the inherent serial nature of bubble technology. The simple gate interconnection geometry has a minimum of feedback paths and results in devices which are not burdened with excessive numbers of bubble generators, annihilators or crossovers.Serial arithmetic functions with magnetic bubble logic elements416103210/07/197916/02/19781979509Williams; Richard P.US Patent and Trademark OfficeGoogle Patent Searchpatentimages.storage.googleapis.com/pages/US4161032-1.pngUniquemagnetic bubble logicbinary integersserial arithmetic functionsserial integer arithmeticinherent serial naturedivision arithmetic operationsadjacent propagation pathsgate interconnection geometrydesignsdevice