Electric machines. The image shows the sewing of bulb spirals of the lumelamp. Each spiral is examined under the microscope before it goes on. The finest spirals have a thread, as only mm in diam. and wound in 3,000 turns on a length of about 5 cm. The value of the spirals is estimated at SEK 30,000 / kg.

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Size: 1905px × 2624px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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