The book The Irrigation Age volume 21 was written by author Federation of Tree Growing Clubs of America Here you can read free online of The Irrigation Age volume 21 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Irrigation Age volume 21 a good or bad book?
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The adjusting head b screws directly to the top of the tripod and is flexibly bubble is at the center. The turret is then turned at right angles to its first position and the third screw turned until the level is again horizontal. The upper and lower faces of the turret proper are parallel, so that it is reversible. The telescope passes through diamet- rically opposite holes in the turret and may be adjusted bv means of the screws d, to make certain its accurate position. The testing consists o...f sighting on an object through the telescope when it rests in its normal posi- Fig. 1 . Bostrom's Improved Builders' Level. General View of Instrument ready for use. tion, as shown, and in sighting on the same object after reversing the turret so that its former upper face be- comes the face resting on the turret support. The adjusting screws c are provided for correcting the level if it is found to be out of adjustment. It may be easily tested by leveling it and turning it end for end, when the bubble should still be in the center.
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