| Answer | Crossword Clue |
|---|---|
| masers | MASER, a device for amplifying electrical impulses |
| maser | a device for amplifying electrical impulses |
| camerae | device that consists of a lightproof chamber with an aperture fitted with a lens and a shutter through which the image of an object is projected onto a surface for recording (as on film) or for translation into electrical impulses (as for television broadcast) |
| tens | self-operated portable device used to treat chronic pain by sending electrical impulses through electrodes placed over the painful area |
