 | Massachusetts - 1875 - 692 頁
...depth of ten inches, a thread having been cut for this purpose on the outside of it. No sap could enter this gauge except at the very centre of the heart-wood...were taken regularly at six AM, at noon, and at six PM, for about ten weeks, until the changes became unimportant. The table appended gives all the variations... | |
 | United States. Forest Service, United States. Department of Agriculture - 1878 - 662 頁
...inches into the tree, admitting no вар except from пелг the conter of heart- wood. Gauge No. 5 was attached to the sap-wood, among the branches, at an elevation of 20 feet above No.1. The apper ganges of the yellow birch and vine were 30 feet above the lower ones.... | |
 | United States. Department of Agriculture - 1878 - 668 頁
...screwed 10 inches into the tree, admitting no sap except from near the center of heart-wood. Gauge No. 5 was attached to the sap-wood, among the branches, at an elevation of 20 feet above No. 1. The npper gauges of the yellow birch and vine were 30 feet above the lower ones.... | |
 | State Pomological Society of Michigan - 1875 - 592 頁
...purpose on the outside of it. No sap could enter this gauge except at the very center of the heart- wood of the trunk. Number five was attached to the sap-wood...the branches, at an elevation of twenty feet above gange number one. The gauges thus connected were then enclosed in tight pine cases, and the metallic... | |
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... remained in the soil just as it grew. Number four was fastened to a piece of gas-pipe one inch in diameter, which was screwed into the tree to the depth of ten inches, a thread having been cut for this purpose on the outside of it. No sap could enter... 