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Above: Dew Shield as provided for the Telrad sight (72,105 bytes).
Click on image to see enlarged view (230,719 bytes).
The Telrad sight consists of a red Light Emitting Diode (LED) powered by two "AA" batteries where the LED source projects a red light through a reticle pattern overlay, then to a mirror and lens and finally onto a window tilted at 45 degrees to the viewer. From the observer's perspective the three ring reticle pattern appears to suspended over the blackness of space in the distance. Since astronomy is often conducted in environments prone to dew accumulation or frost, the window of the Telrad tends to become obscured by accumulated dew or frost on humid nights. The Dew Shield was developed to help keep these off the window by reducing the volume of humidity laden air that passes in contact with the normally exposed sight window. The Dew Shield can also provide some added protection for the Telrad window.
Installation of the Telrad Pulser:
Using the Telrad Dew Shield:
Above: at left the Telrad with Dew Shield stored (74,237 bytes), and at right retracted for use (92,504 bytes).
Click on images to see enlarged view (188,1076 and 152,722 bytes).
TELRAD DEW SHIELD SPECIFICATIONS
Right: Dew Shield installed and retracted for use. Note orientation of the two metal hinges (85,505 bytes).
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