... Dew point depression: >= 4њF or 2њC . Dust count < 10,000 units . ... Do not push the dust limit and the dew point limit at the same time. ... If the dust counts are near the stated limit, it is best to have a dew point ...
... Caution must be exercised when dressing wheels to ensure dust is trapped and excessive pressure is not applied to the wheel. ... They serve two functions: to protect operators in case of wheel breakage and to trap grinding dust. ...
... it must protect the telescope from dust, rain, snow, high humidity, and insects ... The enclosure must provide an effective barrier to wind, dust, and precipitation. ... a contacting dry seal will provide a physical barrier to dust, air and insects ...
... If this can't be done, stay in the cone room of the 3.5m enclosure. Use available dust masks to filter the smoke when on site. 5. Fire-fighting . ...
... Very low dust, aerosol content, and water vapor, as well as low scattered light from natural and artificial sources, minimizes blurring of images and provides "good seeing." ...