Artifact Details

Description

Black and white. Johnniac exhibit at 1700 Main Open house. To the right is Johnniac mainframe without components installed. To the left is a table with two exhibits.
The left exhibit shows a selectron tube tester. The label: "Selectron This special RCA tube will be used in the internal memory of the Johnniac machine. Each tube can remember 256 binary digits. As exhibited here, the tube is in a test unit, the green spots indicate where a digit '1' is stored and an unlighted spot a '0'". The exhibit on the right has a magnifying glass over an unknown object. There is an unreadable label.
in front of the exhibt are standards with cloth cables to restrict visitors.

Identifying Numbers

Other number

#1538

Verso pencil

Dimensions

overall: 8 in x 10 in

Category

Photograph

Credit

Courtesy of Gwen Bell

Lot Number

X7413.2015

Related Records

102689106	Johnniac - Exhibit - 1700 Main Open House
102689087	Johnniac - Exhibit - 1700 Main Open House