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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... "
Observations on the Phenomena of Plant Life: A Paper Presented to the ... - 第 54 頁
William Smith Clark 著 - 1875 - 111 頁
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Public Documents of Massachusetts, 第 3-4 卷

Massachusetts - 1875
...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...
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Report on Forestry ...

United States. Forest Service, United States. Department of Agriculture - 1878
...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....
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Report Upon Forestry

Franklin Benjamin Hough, United States. Department of Agriculture - 1878 - 650 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....
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Annual Report of the Secretary of the State Pomological Society of ..., 第 4 卷

State Pomological Society of Michigan - 1875
...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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