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When I shown people the compass quite a few say they find the price a bit expensive for a modification consisting only of a couple of markers on the outside of the compass.
Well if you look a bit closer you notice the vital pointers on the edge of the compass card. And most of the work with the modification is inside the compass.
First the liquid is poured from the compass. Then the compass is opened with a specially made tool.
Making the pointers assembly (finally mounted on the compass card).
The pointers are cut to the right size.
A circular transparent plate card is made.
Then the pointers are mounted on the circular plate with precision.
The base of the compass card is detached from the compass housing and modified to accommodate the pointers assembly.
The pointers assembly is mounted on the compass card. First orientated, then temporarily glued. Some six minute holes are drilled and the assembly is then secured with thin metal thread.
The base of the compass card is mounted in the housing. The play between the pointers and the inside of the compass housing is checked and adjusted.
The compass is closed with a specially made tool and again filled with liquid.
The movable outside markers are made by hand. Each consists of some two parts glued together and trimmed for appearance and size by hand.
The markers are mounted on the outside of the compass.
Finally each compass shall hopefully also bear its cost of development, patents (a few thousands of US$), design patents, writing of the instruction manual, production of leaflets, selling costs and also the production of these Internet pages (the last took in the order of 100 hours). And as the production is small the cost per compass becomes considerable.
There are also taxes to be paid. Purchase tax to be paid for compasses sent to European Community countries is 20 percent.
The world's fastest skate sail, 120 km/h (75 MPH) is another of my top performance designs.
So, altogether these compasses are not expensive. Especially when you consider how much more user friendly they are compared to the Electronic Compasses.
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Modified August 2015
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