. Elementary physics and chemistry: second stage. Science. 102 ELEMENTARY PHYSICS AND CHEMISTRY. 6. An iron i lb. weight is allowed to rust. Will it weigh more or less than i lb. when it is rusty ? If the rust is cleaned oft", will the weight be a true i lb. ? If not, how will it be wrong, and why ? LESSON XVII. THE ACTION OF PHOSPHORUS ON AIR. PRACTICAL WORK. Things required.—Red and yellow phosphorus. Test-tube, fitted with a good cork or india-rubber stopper. Slate, tile, or an old saucer. Basin of watei-. Apparatus shown in Fig, 57. Strip of gummed paper, What to do. Read the caution
. Elementary physics and chemistry: second stage. Science. 102 ELEMENTARY PHYSICS AND CHEMISTRY. 6. An iron i lb. weight is allowed to rust. Will it weigh more or less than i lb. when it is rusty ? If the rust is cleaned oft", will the weight be a true i lb. ? If not, how will it be wrong, and why ? LESSON XVII. THE ACTION OF PHOSPHORUS ON AIR. PRACTICAL WORK. Things required.—Red and yellow phosphorus. Test-tube, fitted with a good cork or india-rubber stopper. Slate, tile, or an old saucer. Basin of watei-. Apparatus shown in Fig, 57. Strip of gummed paper, What to do. Read the caution on p. 105. TJie burning of p/ FlG. 55.—After the phosphorus has burned in the corked test-tube, the test-tube is un- corked under water, and water enters to take the place of tlie air used up. Place a little phosphorus upon a slate, tile, or an old saucer. Apply a light to it. It catches on fire and burns brightly. As it burns, dense white clouds are formed. Volume of air used up ivhe7i phosphorus burns. —Place a little red (or yellow), phosphorus in a test-tube fitted with a good cork. Fix the stop- per firmly in the test-tube. Hold the test-tube slant- ingly, by means of a test- tube holder, over a flame for a minute or two, so as to heat the phosphorus and make it burn. When it will burn no longer, take away the test-tube and let it cool for five or ten Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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