Popup (or contextual) menus appear when you right-click the mouse. They are a part of almost every Windows program. Nonetheless, it took me some effort to find out how to create popup menus in RealBasic with all the features that I needed. The examples supplied by Real Studio were either out-of-date or simplistic. The only other [...]
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One of my all-time treasured possessions is a Gerber Variable Scale [1] (Fig. 1). It was an absolute must-have if you were doing science in the 60s and 70s. The idea was straightforward — the device was a ruler consisting of a precision spring that you could adjust to any length to match graphs or oscillographs [2]. [...] On average, physical intuition is useful half the time and misleading the other half. As a case in point, a trial user set up what he felt was the most basic magnet problem to test Magnum. The program returned results that differed from his expectation by about a factor of five. He contacted me to find [...] A recent trial user had an application that required creation of a three-dimensional mesh of a printed circuit. Such an object is thin in z with relatively complex spatial variations in x-y. The user attempted to represent the full complement of conductors as a single, thin STL solid object with thousands of facets. It would have [...] High-current electron-beam guns typically have the geometry of Fig. 1. The flat or concave cathode operates in the space-charge limited mode. A shaped focusing electrode compensates for the effect of beam-generated electric fields to generate a parallel or converging beam. The heated cathode is composed of a high-temperature material like tungsten. The focusing electrode is composed [...] |
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