Texas, 1913...
Photographer's Caption
Four year old cotton picker who picks fifteen pounds a day regularly and seven year old who picks fifty pounds a day. They live in wagons. Moving about from farm to farm. Location: McKinney [vicinity], Texas...
Source
National Child Labor Committee Lewis Hine photographer
University of Arizona engineering student operating an IBM 650 computerą. The machine was installed at the University's Engineering Experiment Station in 1957 to solve research problems submitted by the UA Numerical Analysis Lab, as well as government and private businesses. The 2000 vacuum tube IBM 650 Magnetic Drum˛ Data-Processing Machine was an early digital computer produced by IBM in 1954, the world's first mass produced computer, selling 2000 systems, highly popular in universities where a generation of students first learned programming. This 13 kW machine was a two-address, ten-digit bi-quinarył coded decimal computer (both data and addresses were decimal), running at 125 kHz with memory on a 4000 word magnetic drum rotating at 12,500 rpm, taking 27.6 ms per instruction resulting in an average speed of 40 instructions per second, each word was a signed 10-digit number or five characters. She programmed it using IBM's Symbolic Optimal Assembly Program⁴ (SOAP II), an assembler language developed by Stan Poley at the IBM Thomas J. Watson Research Center. SOAP II is called "Optimal" (or "Optimum") because it attempts to store generated instructions on the spinning storage drum to minimize the access time from one instruction to the next.
Michel Talbot
Inside the IBM 650. Performance-wise it could do 78,000 additions or 5,000 multiplications per minute, and can make over 2,000 logical selections per second. The average access time for data on the 12500 rpm drum was 2.4 ms. On the magnetic drum, the two-out-of-five code representation is used [0,1,2,3,6] where (0=01100) 1=11000 2=10100, 3=10010, 4=01010 5=00110 6=10001 7=01001 8=00101 9=00011.