It can take a big push to start an object with large inertia, see signature file below. regards, Graham Daniel. Alice Campbell wrote: <> Mechanically, yes, bashing on a clogged pipe > (hammer, ultrasound, singing) will remove the scale, but leave a lot > of seedbed behind for more scale to form. it needs both bashing and > cleaning with a wire brush and acid bath to get the scale and the > seedbed for the scale to go away. of course it comes back > eventually. Chemical deionization and chemical softening do work, > but because of expense people want magic i guess. > currently working on next-generation perpetual motion machine... > pic-based, with piezoelectic shoe power and optimized quadrature > encoding. will write when.... > > alice -- Steam engines may be out of fashion, but when you consider that an internal combustion engine would require recovery of waste heat by transfer just before top dead centre then fashion becomes rather redundant, USE STRATIFIED HEAT EXCHANGERS ! and external combustion. You heard it first from: Graham Daniel, managing director of Electronic Product Enhancements. Phone NZ 04 387 4347, Fax NZ 04 3874348, Cellular NZ 021 954 196.