Table 4 

 Calculations for the Focal Point Using the Zingg Formiila 



Reach.No„ dgg Z' = 10 d mm Z' U' = 20dm U' ft/sec 



mm (ft) (m/h) 



1 



1.30 



13.0 



0.0427 



26,00 



38.00 



2 



1.20 



12.0 



0.0394 



24.0 



35.00 



3 



0.38 



3.8 



0.0125 



7.6 



11.30 



4 



0.45 



4.5 



0.0147 



9.0 



13.20 



5 



0.355 



3.55 



0.0116 



7.10 



10.40 



6 



0.80 



8.0 



0.0262 



16.00 



23.50 



7 



0.60 



6.0 



0.0197 



12.00 



17.60 



8 



0.58 



5.80 



0.019 



11.60 



17.00 



15 



