31. Beckman had continued to develop the infrared spectrophotometer after the release of the IR-1. 32. An absorption spectrophotometer measures the absorption of light by a sample as a function of wavelength. 33. Initially the medical spectrophotometer had a mask-style attachment, into which the patient breathed. 34. Beckman Instruments shipped the first 1R-1 spectrophotometer to Shell on September 18, 1942. 35. Then, using a spectrophotometer , they were able to measure the light absorbance of the pigments. 36. Around the same time Hewlett Packard added an in-line spectrophotometer to their HP 2100 printer. 37. Years later Epson added an in-line spectrophotometer to their Stylus 7900 / 9900 printer line. 38. UV-visible microspectrophotometers consist of a UV-visible microscope integrated with a UV-visible spectrophotometer . 39. The DU spectrophotometer was also an important tool for scientists studying and producing the new wonder drug penicillin. 40. Additionally, most modern mid-infrared spectrophotometers use a Fourier transform technique to acquire the spectral information.
