Robert T. Morris

“ I think that the chief cause why ice melts more quickly about the edge of a pond than the rest of it, is that the surrounding earth is warmer than the water farther out. This is due largely to the fact that the darker-colored earth absorbs the sun’s heat much more than ice. ”

“ That shallow water would warm up more quickly than deeper water is undoubtedly true, especially after the ice has gone at the edge, for the ice certainly reflects the sun’s heat more than the water does, so that the ice would tend to keep on melting around the edge of the pond. ”

“ No. 3. “A mass of streaks, some of them appearing black.”
No. 3 shows a mass of streaks, some of them appearing black. In this instance, I am positive that we have a plain case of “reversal,” that is, when a bright object appears as dark on the negative. We can cause reversal of the image in several ways, for example by photographing a spark from a static electric machine, and after it has been impressed on the plate, opening the shutter for an instant in a subdued light. We will then find, on developing, that the image of the spark has been reversed and shows black. ”