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A nightstand, [1] alternatively night table, bedside table, daystand or bedside cabinet, is a small table or cabinet designed to stand beside a bed or elsewhere in a bedroom. Modern nightstands are usually small bedside tables, often with one or sometimes more drawers and/or shelves and less commonly with a small door. They are often used to ...
Edmund Germer, Friedrich Meyer, and Hans Spanner patented a high-pressure vapor lamp in 1927. [6] George Inman later teamed with General Electric to create a practical fluorescent lamp, sold in 1938 and patented in 1941. [6] Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures.
Light pollution: Because white LEDs emit more short wavelength light than sources such as high-pressure sodium vapor lamps, the increased blue and green sensitivity of scotopic vision means that white LEDs used in outdoor lighting cause substantially more sky glow.
A 1652 handbill advertising coffee for sale in St. Michael's Alley, London. The earliest credible evidence of coffee drinking or knowledge of the coffee tree appears in the middle of the 15th century in the accounts of Ahmed al-Ghaffar in Yemen, [3] where coffee seeds were first roasted and brewed in a similar way to how it is prepared now.
Coolidge threw a switch at 8 p.m. to light the tree. [27] [30] It was the only year a switch was used; before and since, a button has been pushed. [28] Although the president did not address the people, he and Mrs. Grace Coolidge stayed to sing Christmas carols with the large crowd of several thousand. [25]
Helium–cadmium lasers are a common source of blue or ultraviolet laser light. Lasers at wavelengths of 325, 354 and 442 nm are made using this gain medium; some models can switch between these wavelengths. They are notably used in fluorescence microscopy as well as various laboratory uses requiring laser light at these wavelengths. [57] [58]