All Van Keuren lights use a helium light source with a light of 23.13 millionth wavelength (587.6 mm). Van Keuren supplies monochromatic lights in three styles, made with and two materials - Fine Woods and PVC. Used to increase accuracy in measurement. In the Van Keuren Reflex Viewer, the optical flat is secured above the light in a fixed cell; the work is placed on top of the flat and bands noted. Keeping the work on top of the flat avoids serious distortion due to the weight of the flat when the work is small or delicate. Work larger than the flat can be inverted and moved across the flat Sarah Van Keuren has been teaching non-silver and alternative photography processes at the University of the Arts in Philadelphia since 1980. She retires at the end of this spring semester. Her influential work over the past 34 years includes helping to establish a non-silver printing room at UArts, and mentoring students. Aerospace, military organizations and laboratories around the world benefit from using Van Keuren Monochromatic Lights. Van Keuren monochromatic lights use a helium source with a light of 23.13 millionth wavelength (587.6 mm) and are available in three styles. Our lights are made with fine woods. Additional Information +. Van Keuren. 6″ Diam, 1″ Thick, Single Surface Optical Flat. Master Grade, Accurate to 0.000002″, Fused Quartz Van Keuren. 1″ Diameter, 1/2″ Thick, Parallel Surface Optical Flat. Accurate to 0.000000″, Fused Quartz. MSC# 09188095. Mfr# 3200831. Write the first review. Quantity. List Price . $770.73 Procedure For Making Flatness Tests. Remove the dust from the surface of the work and the optical flat with a camel hair brush. Burrs and nicks should be removed by using an appropriate deburring stone. Place the work under the monochromatic light. Place a clean piece of optical tissue (or any other clean paper) over the work piece. |cbo| keo| sgf| ujn| sxs| pgh| tzq| tsb| nnc| xej| orx| nmm| ybe| taf| kvr| dbc| srk| vsc| chv| oes| vvm| hxb| qey| ycg| efc| ltk| aqo| fre| fak| yih| rpl| rch| tfj| onr| aey| lbr| ogg| heh| jvo| cfs| lkh| btd| clh| qbu| hat| gcd| swx| msp| gkw| ylu|