分光光度计的公开科研资料图片，保留原作者、许可证与来源。示意图、历史资料和实验图片按原图说明识别。
原始图片说明
Beckman Infrared Spectrophotometer Model IR-2 - DPLA - 88a4e5d80f48ad4a30198c2a69445778 (page 1).jpg
The Beckman Instruments IR spectrophotometers began as a request from the Office of Rubber Reserve to Arnold O. Beckman in 1942, asking for an infrared spectrophotometer that they could use to create rubber. Under this contract, Beckman Instruments developed a single-beam spectrophotometer based on Robert Battrain’s extant design, which in 1942 was sold as the IR-1. With the IR-4 in 1956, Beckman Instruments branched out into double-beam design and kicked off a golden age of IR spectrophotometer production that lasted until 1973.
图片用途与识别
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作者与使用许可
作者：Beckman Instruments, Inc
许可：Public domain
