Pillar to PostUpdated: December 3rd, 2018Created: July 21st, 2017
The pillars will be in two pieces, a) the base of some 20" (60cm) square rising to 8" (20cm) square and b) a preformed truncated pyramid of base 6" (150mm) sq; the top 4" (100mm) sq. with 100mm of copper rod protruding some 50mm.
Example: Pillar 1 Base
The mix is 1 bag sand, 1 shovel of OPC, 1 shovel of pea gravel, 1/2 shovel of hydrated lime.
All things considered with no levelling it seems reasonable, one of the small top, truncated pyramids was also fashioned.
Truncated Pyramid Top
Top 100mm square :: Height 100m :: Base 150mm square
Copper Rod of 100mm, 50 mm protruding from top
Given beam widths of 100mm the corner pins are:
length 6500-(2x50)mm or 6400mm | width 4800-(2x50) or 4700mm
diagonal is 7940.4mm (7940)
(6400 x 2350) diagonal is 5685.9mm (5686)
(3200 x 2350) diagonal is 3970.2mm. (3970)
Can do 3:4:5 or 5:12:13
It is easier using a camera so here are two images. It appears as though the hose on the first image is above the bricks upon which the pyramid stands, assuming the water reaches the top of each, which is doesn't. So will adjust.
Second pillar finished though levelling seeming accurate at setting, top now seems some 6mm higher. I have a continuing problem in that the water levels are inconsistent ?? Still 6mm over 6.4m is less than 0.1° slope. There are also slight level differences in the north~south vane. All these can be corrected either by grinding away the cement or using lead or copper shims once the beam has been fashioned to fit.