Technical Innovations 7851 Cessna Ave. Gaithersburg, Maryland PD6 OBSERVATORY

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Charity Cunningham
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1 Technical Innovations 7851 Cessna Ave. Gaithersburg, Maryland PD6 OBSERVATORY The 6' diameter HOME-DOME observatory provides all the convenience and protection of large observatories, but in a limited space. Its small size allows installation on almost any building or structure and is less imposing in communities where neighbors have concerns about their view of your property. Though compact, the PD6 dome will easily accommodate a pier-mounted Schmidt-Cassegrain up to 12", or, depending on the mounting design a 6" Newtonian. There is space for you and a guest but for larger groups, a 10' dome is more appropriate. The 6' HOME- DOME observatory is available in two models. Each has the same 74" diameter dome with a 30" wide slot opening and two piece shutter system. The two shutters move up-and-over, automatically disengaging during opening to nest together at the rear of the dome when open. This patented design makes the full shutter opening available to the astronomer (and assists in sky orientation for students). The dome turns easily on hard rubber, sealed ball-bearing rollers mounted on the base ring portion of the wall. You can add motors to rotate the dome and move the shutters, and even fully automate and operate the dome remotely with our Digital Dome Works package. Weather protection is assured by overlapping flanges and baffling, not seals that will wear out or deteriorate. Temperature control is provided by a brilliant white exterior gel coat that normally keeps inside temperature within a few degrees of the shade temperature, so no cool-down period is required before your observing session begins. A dark blue interior helps preserve dark adaptation. The domes use bolt-together construction. Assembly requires alignment of parts, measuring and drilling bolt holes, and use of common hand and power tools. Larger holes, for rollers and latches, are cut and finished at the factory. Typically, domes are assembled in place by two or three persons, without cranes or special equipment. The PD6 can typically be assembled in one day with two people The PD6 is most commonly mounted directly onto a concrete pad or wooden deck. In some cases, the dome has been mounted onto a platform of flat roof of a building. The dome sits on a 45" high wall/base ring for a total internal height of 6'10". The PD6 is strong but very lightweight. The dome comes with 45" high, 19 wide, full height access door for un-hindered entry in the Home position with the shutter open. Moving equipment in and out of the observatory does not pose any problem. For added floor space, you can add one or more computer cubbies. Your dome must be bolted to a secure foundation. The base has an internal flange for mounting to your structure.

2 Nominal dome diameter 74" Base ring/wall O.D. 72" Base ring/wall I.D. 66" Wall height 45" Height at Center w/ wall 82 Door width 19" Material of construction Fiberglass polyester resin, 3/16" thick min. Surfaces Gel-coat Color, Outside/Inside White/Dark blue (custom colors avail) Shutter opening - Width 30" - Height 12" past zenith Shutter design 1 ea. front & top Shutter Movement Up and over, selfstoring in rear Rollers PD6-10, (3 in. diameter) sealed ball bearing Weight, dome and shutters 110 lbs Weight, total with walls 200 lbs. Force to turn dome 10 lbs. Force to open shutters 15 lbs. Force to close shutters 20 lbs.

3 DOMB R.BVBR.SB PLANGB BASB R.ING UPPBR. PLANGB DSR. SKIR.T ("- hl.h) R.OLLBR. "5- WALL/BASB R.ING on PD6 BASB R.ING LOWBR. PLANGB INCHBS (2.5- wido) \ OUTSIDB DIAMBTBR. BOLT TO P 0 U N D A T ION SKI.. T (OPTIONAL) ----,;;..I...r=====obo;;: """ -;:::::'" POUNDATION (11.er protided) PD6 Wa11/Base Ring Structure

4 CUBBY 40" HIGH AT DOME WALL WALL SECTION WI COMPUTER CUBBY WALL SECTION JOINT fnterior FLOOR FLOOR FLANGES OME EXTERIOR 36" IUS \\..', \, \, INCH TO SCALEl FLOOR FLANGE WITH NO CUBBlES i: i Az Sensor id I Hole i,,-r /1: f-1" :' I ' //3;3/4 11,, L..._. I! /, '1- \ DOOR 20 1/4" - ROLLER HORIZONTAL SECTION THROUGH WALL SHOWING FLOOR FLANGES AND ROLLER! DOME DRIVE LOCATIONS IN UPPER FLANGE ABOVE FLOOR FLANGES ROLLER HOLE HOLE OR OPTIONAL DOME DRIVE NOTE: OBSERVATORY CAN HAVE 0,1,2, OR 3 CUBBIES Observatory foundation should be 2" larger than base. PD6 with Computer Cubbies

5 p I.BAI. COVBI. INSIDB SI1I.PACB DOMB HAL. (LB'T) DOMB HALP (J.IGHT) otioa Joiat DOMB SUPPO T lung 8ltIJlT DJ.AW. ING: BJ.ACltBT HINGB /' BUILT-IN SBMI-DOOJ. BASB WALL (THUB SBCTIONS) PD6 FRONT VIEW

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