Number of panels in the lens apparatus. Eight
Number of prisms of each panel above dioptric drum or central belt of the lens. Eighteen
Number of prisms of each panel below dioptric drum or central belt of lens. Eight
Service table. Wooden service table in watchroom.
Tube leading through the center of the upper metal ring of the lens into the cowl, to carry off the gases of combustion and to assist in producing a proper draught in the lantern—of what material, diameter, and how fitted and connected with damper tube when in place.
Tube made of iron, four inches in diameter supported and held in place by lugs. The upper end of the damper tube fits closely into its lower end. Tube 2’ 9 7/8” long 3 12/16” diameter
If revolving, revolving machinery.
Revolving cord or chain—how led.
Length of drop tube.
Length of time revolving machinery will run after being wound up.
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