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By R. S. Scorer and R. S. Scorer (Auth.)

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I t is a v e r y complicated business to c o m p o u n d the v a r i o u s r e q u i r e m e n t s o f p e r f o r m a n c e as a r e m o v e r o f gases f r o m a furnace a n d as a disposer o f p o l l u t i o n , the cost, the a p p e a r a n c e , a n d the structural design, i n t o a single c a l c u l a t i o n , a n d so there has a l w a y s b e e n a n insistent d e m a n d for a f o r m u l a t o represent e a c h factor. O u r p u r p o s e h e r e is t o e x p l a i n w h y i t has n o t b e e n possible t o express t h e p e r f o r m a n c e o f a c h i m n e y as a p o l l u t e r o f t h e air i n a single f o r m u l a .

TABLE 350 -010 direction % Μ frequency 3 020 -040 050 -070 080 -100 110 -130 140 -160 11 0-4 0-8 1-3 0-8 170 1-190 i 1-6 200 -220 230 -250 260 -280 290 -310 1-3 0-7 0-7 0-5 320 -340 Μ E x p e r i e n c e o f the drift o f f o g a n d s m o k e in w i n d s o f 3 knots o r less s h o w e d that it n e a r l y a l w a y s drifted f r o m the south o r south­ east. T h i s s h o w e d t h a t the t r e n d i n d i c a t e d b y T a b l e s 1 a n d 3 for north-westerly winds to be less frequent at l o w speeds c o n t i n u e d .

Poll. 6 , p . 2 7 ) , but it takes n o a c c o u n t o f the f r e q u e n c y o f o c c u r r e n c e o f w i n d s o f the speed so c o m p u t e d , a n d is i n dispute anyway because f o r m u l a ( 2 6 ) is not a g r e e d a n d so ( 3 0 ) o r ( 3 2 ) o r s o m e intermediate form cannot be decided upon. One o f the c h i e f reasons w h y ( 2 6 ) is u n c e r t a i n is that varies enormously from day to d a y and even from hour to hour, and w h e t h e r the f o r m o f ( 2 6 ) is a g r e e d o r n o t , e v e n i f the values o f a , β, a n d λ are undisputed, is necessarily o f m a j o r i m p o r t a n c e in a n y f o r m u l a .

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