DONNER SCIENTIFIC COMPANY

Model 30 Donner Scientific Company Berkeley, California Operating range: +/- 100 volts DC Features: 10 - Amplifiers   Removable problem board   Reset and hold circuits for 5 integrators   Two or more computers can be interconnected to work together. Options: Cyclic-reset timer for repetitive operations. Self-contained options: Coefficient-setting potentiometers   Calibration bridge   Time-division multiplier   Simple logarithmic multiplier   Diode function generator   Low-frequency sine-wave generator

Model 3100 Donner Scientific Company Concord, California Introduced in 1958. Technology: Vacuum tubes Operating range: +/- 100 volts DC Computing Elements: 30 - Amplifiers   40 - Coefficient potentiometers

Control panel of the Donner 3100. In the bottom of the picture is the five rows of eight coefficient potentimeters for a total of 40. In the center of the control panel is the 15 initial condition potentimeters. To the right is the problem board.

Model 3200

Model 3500

Model 3500 (portable) Donner Scientific Company Concord, California Introduced about 1960. Technology: Vacuum tubes Operating range: +/- 100 volts DC Computing Elements: 10 - Amplifiers consisting of:   5 - integrators, and   5 - summers.   5 - Coefficient potentiometers.

Optional Model 3530 Auxiliary Problem Board

Sold as a set of two problem boards, each is 12 inches long, 8 inches wide, and 4.5 inches high with a 38 inch cable to connect to the computer.