US143942A - Improvement in shading-levels - Google Patents
Improvement in shading-levels Download PDFInfo
- Publication number
- US143942A US143942A US143942DA US143942A US 143942 A US143942 A US 143942A US 143942D A US143942D A US 143942DA US 143942 A US143942 A US 143942A
- Authority
- US
- United States
- Prior art keywords
- bar
- level
- improvement
- levels
- shading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000036633 rest Effects 0.000 description 2
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
- G01C9/24—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble
Definitions
- the invention is an improvement in the class of grading instruments formed by providing an ordinary spirit-level with an adjustable or extensible graduated bar.
- My improvement consists in a hollow rackba-r and an extension-bar arranged to slide into and out of the same, both operated by a pinion, or equivalent means, and adapted to be secured in any desired adjustment by means of a clamp-screw, all as heretofore described.
- the bar A is shown provided with the ordinary bubble-tubes a b, forming thus a level ofthe kind in common use.
- One end of the level is recessed to receive a box or tube, B, containing a pinion, (l, and rack-bar D, whose teeth mesh into each other, so that, by turning the exterior milled head c, the bar bar can' be caused to project from thc tube.
- a clamp-screw, d. also provided with a milled head, is suitably arranged to secure the bar in any desired position.
- the bar is graduated in inches and fractions of an inch, one inch on the same indicating a grade of one-half inch to the lineal foot.
- the bar is made hollow or tubular to receive an extension, F, which is similarly graduated and of the same length.
- an extension, F which is similarly graduated and of the same length.
- said bar may be clamped or secured in like manner as the bar D, and independently thereof; but in practical operation the bar F will be extended from the bar D when and so far as the grade seems to require, and, having been secured by the screw e, both it and the bar D may be adjusted together.
- the ease, rapidity, and accuracy with which the bar or bars may be adjusted, and a grade thereby indicated, are obvious, while the peculiar arrangement of the eXtension-bar F enables grades to be ascertained which have twice the inclination that bar D is competent to indicate.
- the level is applied to the surface whose inclination or angle is to be determined, the bubbletube a being uppermost.
- the end H of the level is then elevated until the bubble indicates the horizon, whereupon the milled head c is turned until the rackbar projects far enough to come in contact with the surface on which the 4level rests.
- the screw d is then made to clampthe bar, so that it will support the raised end of the level at the determined angle.
- the inches or fractions of an inchl which it projects below the level the required elevation will be ascertained., Thus, if the bar project one inch below the level, the grade or inclination is one-half inch to the foot; if two inches, then the grade is one inch to the foot. Any other scale of graduation may be adopted.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Description
l. THORNL'EY.
Grading-Levels.
Patente'docn 21;,1813.
(Q Witnesses i lllrlxlll UNITED STATES PATENT OFFICE.
JOHN THORNLEY, OF OHARLOTTESVILLE, VIRGINIA.
IMPROVEMENT IN GRADING-LEVELS.
Specification forming part of Letters Patent N o. 143,942, dated October 2l, 1873; application filed July 2l, 1873.
To all whom it may concern:
Be it known that I, Dr. JOHN THORNLEY, of Charlottesville, in the county of Albemarle and State of Virginia, have invented a new and Improved Inclinometer or Grading-Level 5 and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure l is a side elevation. of the instrlt ment as applied in practice. Fig. 2 is a vervtical section of the adjusting devices applied to the level. Figs. 3 and 4 are elevations of the inner and outer faces or sides of the adjusting attachment.
The invention is an improvement in the class of grading instruments formed by providing an ordinary spirit-level with an adjustable or extensible graduated bar.
My improvement consists in a hollow rackba-r and an extension-bar arranged to slide into and out of the same, both operated by a pinion, or equivalent means, and adapted to be secured in any desired adjustment by means of a clamp-screw, all as heretofore described.
In the drawing, the bar A is shown provided with the ordinary bubble-tubes a b, forming thus a level ofthe kind in common use. One end of the level is recessed to receive a box or tube, B, containing a pinion, (l, and rack-bar D, whose teeth mesh into each other, so that, by turning the exterior milled head c, the bar bar can' be caused to project from thc tube. A clamp-screw, d., also provided with a milled head, is suitably arranged to secure the bar in any desired position. The bar is graduated in inches and fractions of an inch, one inch on the same indicating a grade of one-half inch to the lineal foot. The bar is made hollow or tubular to receive an extension, F, which is similarly graduated and of the same length. By means of the screw d, said bar may be clamped or secured in like manner as the bar D, and independently thereof; but in practical operation the bar F will be extended from the bar D when and so far as the grade seems to require, and, having been secured by the screw e, both it and the bar D may be adjusted together. The ease, rapidity, and accuracy with which the bar or bars may be adjusted, and a grade thereby indicated, are obvious, while the peculiar arrangement of the eXtension-bar F enables grades to be ascertained which have twice the inclination that bar D is competent to indicate.
To use the implement, the level is applied to the surface whose inclination or angle is to be determined, the bubbletube a being uppermost. The end H of the level is then elevated until the bubble indicates the horizon, whereupon the milled head c is turned until the rackbar projects far enough to come in contact with the surface on which the 4level rests. The screw d is then made to clampthe bar, so that it will support the raised end of the level at the determined angle. By noting on the bar the inches or fractions of an inchl which it projects below the level, the required elevation will be ascertained., Thus, if the bar project one inch below the level, the grade or inclination is one-half inch to the foot; if two inches, then the grade is one inch to the foot. Any other scale of graduation may be adopted.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-
I-n combination with the graduatedrack-bar:
D, operated by pinion O, or equivalent, and clamped by screw E, the extension-bar F, arranged to slide in and out of the same, all applied to a level, A, as shown and described, to operate as specified.
DR.. JOHN THORNLEY.
Witnesses H. H. GEORGE, JOEL WILL.
Publications (1)
Publication Number | Publication Date |
---|---|
US143942A true US143942A (en) | 1873-10-21 |
Family
ID=2213355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US143942D Expired - Lifetime US143942A (en) | Improvement in shading-levels |
Country Status (1)
Country | Link |
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US (1) | US143942A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2634503A (en) * | 1949-08-11 | 1953-04-14 | Richardson Harry Dunreath | Angle measuring tool |
US2746164A (en) * | 1954-04-01 | 1956-05-22 | William C H Eitzen | Grade measuring attachment for carpenters' or builders' levels |
US20050252016A1 (en) * | 2004-05-17 | 2005-11-17 | Helda Eric J | Spirit level with integrated inclination adjustment mechanism |
US20050283583A1 (en) * | 2004-05-11 | 2005-12-22 | Hitachi, Ltd. | System and method for configuration management of storage system |
US20090113733A1 (en) * | 2007-11-05 | 2009-05-07 | Hale Brian K | Extendable plumb and level measuring device and associated usage method |
AT518031A1 (en) * | 2015-11-30 | 2017-06-15 | Sola-Messwerkzeuge Gmbh | Spirit level for slope determination |
-
0
- US US143942D patent/US143942A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2634503A (en) * | 1949-08-11 | 1953-04-14 | Richardson Harry Dunreath | Angle measuring tool |
US2746164A (en) * | 1954-04-01 | 1956-05-22 | William C H Eitzen | Grade measuring attachment for carpenters' or builders' levels |
US20050283583A1 (en) * | 2004-05-11 | 2005-12-22 | Hitachi, Ltd. | System and method for configuration management of storage system |
US20050252016A1 (en) * | 2004-05-17 | 2005-11-17 | Helda Eric J | Spirit level with integrated inclination adjustment mechanism |
US7086166B2 (en) | 2004-05-17 | 2006-08-08 | Irwin Industrial Tool Company | Spirit level with integrated inclination adjustment mechanism |
US20090113733A1 (en) * | 2007-11-05 | 2009-05-07 | Hale Brian K | Extendable plumb and level measuring device and associated usage method |
US8413343B2 (en) * | 2007-11-05 | 2013-04-09 | Brian K. HALE | Extendable plumb and level measuring device and associated usage method |
AT518031A1 (en) * | 2015-11-30 | 2017-06-15 | Sola-Messwerkzeuge Gmbh | Spirit level for slope determination |
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