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412
AYLING
October
from copper deposits caused by carbon sputtering or falling molten copper, a special heat-treated glass deflection shield, 2x/2 inches by 4 inches, is inserted between the arc and bottom portion of the reflector. The copper deposits will collect on this shield which can be replaced from time to time at very little cost. There is negligible light loss as a result of this glass. A special safety feature is a door-operated line switch to assure that all power to the arc is turned off when the lamphouse door is open. Another line switch (toggle-type) is conveniently located at the top rear section of the lamp.
The lamphouse, constructed entirely of sheet metal, has a large cubical content for the size of the arc, resulting in a cool operating
LEAD SCREW LEAD SCREW
Fig. 3 — Lamphouse.
lamp. The lamphouse door is equipped with a colored glass window for viewing the arc characteristics. An arcescope screen, located at the top rear of the lamp, projects a side pinhole image of the carbons for convenience to the operator in keeping a correct focus.
A five-wire braided cord, from the lamp, is plugged into the yoke terminal box, thereby completing the circuit to the power supply. This method of electrically connecting the lamp and base provides for quick disconnect when disassembling the "Trouper" into two units. Many times the operator must trim the lamp in semidarkness. A door-operated trimming light adds to his convenience.
LENS OPTICAL SYSTEM
The lens optical system is a new method of efficiently utilizing all light passing through the aperture. (Fig. 4.)