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Lightbulbs in Stand
These light bulbs were manufactured around 1905. They can be dated by the construction of the filament. To learn more about antique light bulbs,…
Balance with Weights
The simplest type of balance, the equal-arm, or beam, balance, is an application of a lever. A uniform bar, the beam, is suspended at its exact center on a knife-edge set at right angles to it. The point of support is called the fulcrum. Two pans of…