not over water, Our latitude, Full sun-light, distant views. Early and late in day \frac{8}{50} \quad \left\{\begin{array}{l}10-2=\frac{8}{100} \approx \frac{16}{50}\end{array}\right. \\ “” “\quad \frac{11}{25} \quad \left\{\begin{array}{l}10-2'=\frac{11}{50}\end{array}\right. \\ “” “\quad \frac{16}{12} \quad \left\{\begin{array}{l}10-2=\frac{16}{25}\end{array}\right. Same slightly cloudy. Early and late in day \frac{8}{25} \quad \left\{\begin{array}{l}10-2=\frac{8}{50}\end{array}\right. \\ Hazy or stormy day — 10-2=\frac{8}{25} \text { slight shadows } T \text { to be seen } Dark days — 10-2=\frac{6}{25} \text { no shadows } T \text { to be seen. } \\ \text { doc. 131 }