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CONSTRUCTION DETAILS OF 13-inch BINOCULARS
The CENTER ASSEMBLY
The BASE and CENTER BEARING
These photos demonstrate how the dagger board fits into the base. The assembly would never actually look like this because the dagger board is permanently installed in the center structure with the main bearing as pictured below.
The center bearing is two bronze sleevess against two nylon spacers. Tension can be adjusted and controlled with the wrench. This can be done even when the entire telescope is fully assembled. This works amazingly well, considering it violates many of the common precepts of Dobsonian bearing construction (large bearings riding on teflon pads, etc.)
The TELESCOPE HOLDERS
These assemblies are fairly rigid despite their light weight, especially when compressed against the telescope tubes.
Notice how the vertical and horizontal adjustments are effected by the pivoting action of the right telescope mounting strut.
The left telescope mounting strut is mounted on substantial door hinges to permit interpupillary adjustment..
The control system top to bottom: Horizontal, Vertical, Interpupillary.
THE CONTROL SYSTEM ASSEMBLY
These views are looking down the "throat" of the center assembly. The vertical and interpupillary screws are turned "remotely" by standard slow motion spring extenders as would be found on most german equatorial mounts. This means they can be placed in a convenient position for the user. The first photo shows the interpupillary adjustment screw and spring extender.
The second photo shows the vertical adjustment screw. Note the tensioning spring.
This is the horizontal adjustment control system.
TENSIONING SPRING ASSEMBLY
This assembly counteracts gravity to keep the pivoting, horizontal tube holder pressed against the center structure.
FINAL ASSEMBLY
The strap-on Sonotubes are internally reinforced for stability and the aluminum tubing is padded where it contacts the sonotubes. (In this photo, the control system was not yet fully updated.)