BUILDING LAYOUT W.P.JACKSON PDF
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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Instruments designed for still greater precision have a vernier that further subdivides each minute into seconds. If the radius is large, a small vertical movement on one end of the tube causes a large displacement of the bubble. D.p.jackson shows the accuracy of these readings. A theodolite is essentially a more precise transit.
Building Layout – Surveying Guides – Books and Software – Craftsman Book Company
Level tubes are ground to specific radii. It takes practice to read a vernier with this precision. For precision work use a more sensitive vial. Chapter 1 The Transit A transit is used to measure horizontal and vertical angles. Theodolites are used where precision work is essential. The TAT theodolite reads directly to 10 seconds on the optical micrometer.
When the instrument is properly set up it is directly over the mark. A level vial with a sensitivity of 90 seconds ” per 2 mm is more sensitive than one whose sensitivity is 14 minutes ‘ per 2 mm. But if it is not set up and leveled properly, accurate work is impossible regardless of how accurate the instrument is.
Purchase the most precise transit you can afford. This helps you make error-free readings.
The range of the work and the accuracy required are two factors you must consider before selecting any instrument.
He is active in local government, is currently serving on the planning commission in his community and is a consultant on construction operations.
The greater the precision of the transit, the more sensitive is the level tube built into it.
Since you use a transit for its accuracy, there is no substitute for an accurate instrument regardless of the size of the job. 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 instrument is set up over A, centered over the tack and properly leveled.
A 26x instrument may be used for work up to feet. 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 the 60 to 75 seconds per 2 mm sensitivity range.
Level tube sensitivity is explained later in the chapter.
The list can include farmers, landscapers and many others. If the tripod head is too far out of level, the transit can not be leveled with the leveling screws.
These are extremely precise instruments.
See Detail 1, Figure Write Your Own Review You’re reviewing: Hundreds of valuable suggestions are included: Figure shows two theodolites, each with a micrometer scale. An 18x instrument is usually used in work up to about feet.
The divisions on the circle and vernier are very fine. The degree of magnification of w.p.jaxkson telescope is called its power x. Sensitivity in seconds ” per 2mm division of level tube.
It is marked in degrees and has a vernier scale that subdivides each degree in minutes on the better models.
Building Layout – W. P. Jackson – Google Books
More and more trades are using them to save time, cut builfing, and insure accuracy in their work. Explains how to plan sewer connections, level a foundation that’s out of level, use a story pole and batterboards, work on steep sites, and minimize excavation costs. Figure shows huilding different vernier readings mean in linear distance. The less expensive instruments have a lower power and are used for shorter range.
This book is the result of his interest in improving professional standards among builders. The instrument is set up over A to locate D.
The TAT theodolite reads directly to 20 seconds on the optical micrometer. Instead of a vernier scale, a theodolite is equipped with an optical micrometer scale.
The theodolite has an optical plummet, and the sensitivity of the level tube is usually bujlding, or better. If you are setting up on a paved surface, be sure the points are secure. 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 ,ayout.