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Description Purple Deadnettle is a naturalized herbaceous annual from Europe and Asia which blooms early in the year and is generally considered a weed. Lamium purpurem was first described by Carl Linnaeus in 1753 in the genus Lamium (see attached PDF). L. purpurem consists of square stems 2 to 8 inches in length with leaves…
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The Unboxing… Recently I acquired a Jeol JSM-300T Scanning Electron Microscope. There are some videos on the set up and repair of this scope on the YouTube channel (or will be soon!). I wanted to go into as much detail about the scope, how it works, what it does, how to repair, how to wire…
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Amber Jelly Roll, known by the Latin name Exidia crenata is a brownish jelly fungus that grows on dead hardwood and can be found through out temperate North America in moist environments or after a rain. Exidia crenata is a species of fungus in the family Auriculariaceae. Click on the hyperlink to learn more about Auriculariaceae This…
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Persian Speedwell (Veronica persica), is a low growing annual generally found in moist shady soil though it can be found in dry, sandy or rocky soils. Veronica persica is native to Eurasia but has naturalized throughout North America. During the cool weather of late winter/early spring most of the vegetative growth will occur with flowers…
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A photomultiplier tube is one of a few types of vacuum tubes that are still widely used. In essence it is used to detect very small amounts of light. The tube in the pictures above will be used to detect very small light reactions in a scintillator used to detect muons. The tube works by…
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This is Sylvania 702AT/R switch vacuum tube. It is dated November 1944 and listed as U.S Army Signal Corp stock. I have not been able to find much about this specific tube other than it seems to have been used in the transmitter sections of WWII era radars. It appears this was the first TR…
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The Eimac vacuum tube was produced in the late 30s and primarily used as part of the power oscillating circuit in the American radar system SCR-268 (Figure 2). The radar system would use 16 of these tubes to create the power oscillation section. The 16 v-127As would operate in pulse produce an out put power…