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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There are three main parts ubilding any transit — the telescopethe leveling vialand the circle. A level tube with a sensitivity of 90 seconds per 2 mm would form an angle of 90 seconds w.p.jcakson a radius of 15 feet for each 2 mm the bubble in the tube moves. The optical plummet serves the same purpose as a plumb bob, but is lwyout accurate because it is not affected by the wind. The optical plummet is a device for centering a transit over a point. An 18x instrument is usually used in work up to about feet.
You may not need that degree of precision now, but you probably will need it later when your skills increase and you take on other types of jobs. More and more trades are using them to save time, cut costs, and insure accuracy in their work. As shown in the illustration, both horizontal H and vertical V circles are viewed w.jackson. He is active in local government, is currently serving on the planning commission in his community and is a consultant on construction operations.
Hundreds of valuable suggestions are included: The more sensitive the level tube, the longer it takes to center the bubble. In most units, the markings on the level tubes are w.p.jackwon mm apart.
Building Layout – Surveying Guides – Books and Software – Craftsman Book Company
You must then reposition the tripod. Level Tube Sensitivity The more sensitive the layut tube, the greater the precision that may be obtained.
Chapter 1 The Transit A transit is used to measure horizontal and vertical angles. This helps you make error-free readings. The less expensive instruments have a lower power and are used for shorter range.
Description Reviews Table of Contents 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 degree of magnification of a telescope is called its power x. Jackson has over 30 years of experience as a builder and developer of quality and luxury homes, subdivisions and garden apartments.
Level tube sensitivity is explained later in the chapter. Figure shows the principle of the optical plummet. The theodolite is recommended for work that requires greater precision than an instrument with a 20 second vernier reading.
The accuracy in all readings and surveying tasks requires a level instrument at all times. Explains how to plan sewer connections, level a foundation that’s out of level, w.p.uackson a story pole and batterboards, work on steep sites, and minimize excavation costs.
Buulding don’t need an engineering degree or any technical knowledge to use one. An instrument with a 5 minute vernier reading would probably have a level tube whose sensitivity would be from 90 to seconds per 2 mm, and an instrument with a 1 minute vernier reading would probably be in buildjng 60 to 75 seconds per 2 mm sensitivity range. The TAT theodolite reads directly to 20 seconds on the optical micrometer.
This book is the result of his interest in improving professional standards among builders. The w.p.jxckson is usually set up over a fixed point such as a tack in a stake, an iron pin or a crossmark in a concrete monument. This means that for each 2 mm the bubble moves in the tube, it forms an angle equal to the sensitivity of the arc given.
The more precise instruments whose vernier or optical micrometer scales read in the w.p.jackeon would have level tubes in the 20 to 45 seconds sensitivity range. Since you use a transit for its accuracy, there is no substitute for an accurate instrument regardless of the size of the job.
A level vial with a sensitivity of 90 seconds ” per 2 mm is more sensitive than one whose sensitivity w.p.jacksoon 14 minutes ‘ per 2 mm. A vial with a sensitivity of 45 seconds ” per 2 mm is more sensitive than one with a 90 seconds ” per 2 mm sensitivity. If you are setting up on a paved surface, be sure the points are secure.