Lynde, Carleton John, b. 1872, Gilbert, A. C. (Alfred Carlton), 1884-1961, A.C. Gilbert Company · New Haven, CT : A.C. Gilbert Co. · leaf 38
tubes at the level of the water surfaces. The line along which you sight is exactly horizontal, because the water surfaces are at exactl)^ the same level. Experiment 45. To use the engineers level. An engineers level is used to find the difference in level of two or more *\ points (Fig. 63).To… … GLASb BLOWING 3) must first make what is called a leveling rod. Find a piece ofwood abouv one or two inches square and six or more feet long,mark on it feet and inches, beginning at the bottom end, andyour leveling rod is complete. Now to find the difference in level of two points 100 feetapart,…
Glass blowing and working
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