Shows how to use a transit to locate a building correctly on the lot, plan proper grades with minimum excavation, find Building Layout Author, W.P. Jackson. Building Layout,WP Jackson. Shows how to use a transit, to locate a building correctly on the lot, plan grades with minimum excavation, find utility lines. : Building Layout () by W. P. Jackson and a great selection of similar New, Used and Collectible Books available now at great.
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Jackson There is no substitute for accurate layout of foundations, walls and floors. If the tripod head is too far out of level, the transit can not be leveled with the leveling screws.
The right transit for you depends on your job requirements. The list lwyout include farmers, landscapers and many others. There w.p.jakson three main parts to any transit — the telescopethe leveling vialand the circle. Sensitivity in seconds ” per 2mm division of level tube Radius of curvature w.p.jackson feet 14′ ” 1′-7″ 8′ ” 2′” ” 13′-6″ 90″ 15′ 75″ 18′ 60″ 23′ 45″ 30′ 30″ 45′ 20″ 68′ Radii of Level Tubes of Different Sensitivities Table Write Your Own Review You’re reviewing: Sensitivity in seconds ” per 2mm division of level tube.
Figure shows a transit with a 20 second vernier reading.
The accuracy in all readings and surveying tasks requires a level instrument at all times. This gives d instead of D. As shown in the illustration, both horizontal H and vertical V circles are viewed simultaneously.
This book is the result of his interest in improving professional standards among builders. Figure shows what different vernier readings mean in linear distance.
It is marked in degrees and has a vernier scale that subdivides each degree in minutes on the better models. The divisions on the circle and vernier are very fine. Since you use a layokt for its accuracy, there is no substitute for an accurate instrument regardless of the size of the job. Figure shows the principle of the optical plummet.
Line a-b is parallel to the line of collimation of the telescope and is perpendicular to b-cwhich is the ray of light from the right angle prism at b to the target at c. The more sensitive the level tube, the w.p.jakcson the precision that may be obtained. The more sensitive the level tube, the longer it takes to center the bubble.
Building Layout – Surveying Guides – Books and Software – Craftsman Book Company
Level tubes are ground layouh specific radii. Figure shows a serious error due to an instrument out of level. Description Reviews Table of W.p.jacson Chapter Preview Back Cover Shows how to use a transit to locate a building correctly on the lot, plan proper grades with minimum excavation, find utility lines and easements, establish correct elevations, lay out accurate foundations, and set correct floor heights.
The transit is designed to produce precision work. The advantage of the zoom lens is that it compensates for dim light and changes in distance. Points A, B, and C have been located.
You must then reposition the tripod. The instrument is set up over A, centered over the tack and properly leveled. Level Tube Sensitivity The more sensitive the level tube, the greater the precision that may be obtained. Level buildihg sensitivity is explained later in the chapter.