A Treatise on Staff Making and Pivoting

Containing Complete Directions for Making and Fitting New Staffs from the Raw Material

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Author: Eugene E. Hall
Published: 1910
Language: English
Wordcount: 11,479 / 39 pg
Flesch-Kincaid Reading Ease: 69.2
LoC Category: TS
Downloads: 704
Added to site: 2007.01.09
mnybks.net#: 15762
Origin: gutenberg.org
Genre: Instructional
Excerpt

coming the cohesion of the molecules. Now take a perfectly clean and polished needle and place a drop of oil upon its point and we will see that the oil very rapidly ascends towards the thicker portion of the needle. Now if we heat and hammer out the point of the needle into the form of a small drill and repeat the operation we find that the oil no longer ascends. It rises from the point to the extreme width of the drill portion, but refuses to go beyond. It clings to that portion of the needle which would correspond to the ridge just back of the slope in a conical pivot. Water, oil, etc., when placed in a clean wine glass, do not exhibit a perfectly level surface, but raise at the edges as shown at a in Fig. 6. If a tube is now inserted, we find that the liquid not only rises around the outside of the tube and the edges of the vessel, but also rises in the tube far beyond its mean level, as shown at b. These various effects are caused by one of the forces above described, i. e., th

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