Word: fluid
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Dates: during 1900-1909
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...most interesting of these collections is the case of graphite and clay in their crude forms. Here are shown the various stages in the manufacture of lead pencils, graphite, electrodes and lubricants. The materials are also displayed which illustrate the manufacture of the Welsbach light. Samples of the lighting fluid and the mantle dip, which renders the mantle incandescent, are shown, beside the cotton webbing in the mantle form before it is dipped in the solution of light-giving oxides...
...will when completed, be one of the three largest and most powerful in existence. It will be used for extremely delicate work on faint stars and nebulae, and will be under the complete electrical control of one operator. The reflector, which is of tremendous weight, will rest on a fluid to make manipulation easier...