According to the author's preface, the following work contains "many of the chief facts connected with the origin, the phenomena, and the employment of Colour." The work's early chapters discuss topics concerning…

An informational pamphlet concerned with the K & E Color Analyzer, a spectrophotometer developed by Keuffel & Esser, Co. (K & E). K & E was a drafting instrument and supplies company founded in 1867, making it the first…

This model followed in the tradition of the DU, the first ultraviolent/visible spectrum spectrophotometer.

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called…

Beckman's Model 24 was a double-beam visible light spectrophotometer.

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National Technical Laboratories. Spurred by employee Howard Cary (who had previously been involved in pH meter…

The DU-7 featured a microprocessor and a built in video graphic display. It was released in 1981.

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National…

This model of DU Spectrophotometer was first produced in 1980 and used a mirocomputer to control results, could store up to 9 user-generated programs, and could print results.

The first Beckman Instruments DU…

Beckman released the Model 42 Clinical Spectrophotometer in 1981.

This model of DU Spectrophotometer was first produced in 1980 and used a mirocomputer to control results, could store up to 9 user-generated programs, and could print results.

The first Beckman Instruments DU…

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National Technical Laboratories. Spurred by employee Howard Cary (who had previously been involved in pH meter…