With this new, high-performance Laser, everyone can take advantage of advancing electro-optical technology Coleman Instruments bring you the perfect working laser for coherent light applications in research and engineering. For optical test­ing. For surveying and alignment. For sys­tems development. For a thousand-and-one practical and experimental uses. Its full name: The Perkin-Elmer Helium-Neon Gas Laser, Coleman Model 75.

This new laser emits a continuous, TEM0 0 single mode, red (6328 A) beam in the visible spectrum. Nominal 1.5 milliwatt output (minimum 1.0 mW) ideally combines safety and effectiveness. Maintaining actual diver­gence of less than 0.4 milliradians half-angle, the Model 75 beam throws an intensely bright, small spot hundreds of feet.

Here's the ideal tool for lowering costs in the construction industry, in alignment of mechanical components, centering, deter­

mining levels, grades, straightness, flatness. I t 's an ideal laboratory instrument, too. The laser head is detachable from the solid-state power supply for investigations in optics. A separate tripod may be used, but is not required.

Behind this instrument is the vast laser research experience of The Perkin-Elmer Corporation. Highly skilled Delmar Scien­tific glassblowers shape the long-lasting laser tube, sealing on pure quartz resonator reflec­tors. Anticipated tube life is 4,000 hours; warranty covers one full year. There are no external optics, no complex adjustments, no maintenance. Just flip the switch, press the start button, and you've entered the laser era.

All of this utility is available to you at only $295 for the Coleman Model 75. For full in­formation, send for Coleman Bulletin A-317.

Enter the laser era $295!

Write to Coleman Instruments Division, The Perkin-Elmer Corporation, 42 Madison St., Mavwood, Illinois 60153

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PERKIN-ELMER VOL. 41 , NO. 2, FEBRUARY 1969 · 97 A