| OCR Text |
Show - 4- Pass using the two most effective chemicals revealed by this first test, 2- octanol as an accelerator and N- heptaldehyde as an inhibitor. Uiese tests were intended to check behaviour of the chemical poisoning phenomenon under natural conditions, and to examine the quantity of chemical need for practical effects in the field. The test was made on a north- facing slope adjacent to the snow ranger quarters, and began on 1 February. Existing snow was cleared from the ground and replaced by partially metamorphosed new snow from the surface of the snow cover to a depth of 15- 20 centimeters. The area was divided into three plots, each approximately 0.6 x 0.9 m in size, two for the test chemicals and one as control. As each shovelful of snow was transferred to the test area, it was sprayed with the appropriate chemical from an atomizer. The atomizer was weighed before and after application of each chemical to determine the amount applied; 4.1 grams of N- heptaldehyde and 5.0 grams of 2- octanol were used. Application density was thus approximately 37 and 45 grams of chemical per cubic meter of snow respectively. On 17 March the test plots were dug up and the snow examined. Tbe following results were reported: Control Plot: Growth of irregular crystals ( constructive metamorphism) to size of 2 to 3 mm, but no formation of true depth hoar. Plot with 2- octanol: All crystals were very small ( around 1 mm) and irregular. No depth hoar formed. The chemical odor was still very noticeable. |
