Herbert H. Gottlieb

Low Cost Competition

Laser Beam Modulator

Talking into one end of an empty coffee can vibrates a small mirror that is cemented to a stretched rubber balloon over the opposite end of the coffee can. A laser pointer is mounted on a bent curtain rod section so its beam strikes the mirror and is reflected to a distant screen. Interesting and recognizable patterns of light can be generated on the screen in response to any loud sounds entering the coffee can.