Tuesday, April 24, 1934

Walked to school with Ruth Ray. Walked home with Pauline, Nadine and Donald. Went up to Pauline's and Ruth Ray's.

Laurens Hammond and his invention, the Hammond Organ

American engineer and inventor Laurens Hammond of Chicago received Patent 1.955.350
for an "Electrical Musical Instrument," and introduced the Hammond Organ Model A the following
year. The Hammond Organ was originally sold to churches as a lower-cost alternative to wind-driven
pipe organs, but in the 1960s and 1970s it became a standard keyboard instrument for jazz, blues,
rock music and gospel music.

In addition to the Hammond Organ, Laurens Hammond also invented a silent spring-driven clock,
the Teleview system of shutter-glasses for viewing 3-D films. World War II gave Hammond new
clients for his inventions. He helped design guided missle controls and was awarded patents for
infrared and light sensing devices for bomb guidance, glide bomb controls, a camera shutter and a
new type of gyroscope. The glide bomb was the forerunner of today's guided missiles, carried by
nuclear submarines.

At the time of his death in 1973, Hammonds held over 100 patents.