Knowledge (XXG)

Spirit level

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levelling tools as a "construction level", "heavy duty level", "inclinometer", or "protractor". These modern electronic levels are capable of displaying precise numeric angles within 360° with 0.1° to 0.05° accuracy, can be read from a distance with clarity, and are affordably priced due to mass adoption. They provide features that traditional levels are unable to match. Typically, these features enable steel beam frames under construction to be precisely aligned and levelled to the required orientation, which is vital to ensure the stability, strength and rigidity of steel structures on sites. Digital levels, embedded with angular MEMS technology effectively improve productivity and quality of many modern civil structures. Some recent models feature waterproof IP65 and impact resistance features for harsh working environments.
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is the angle or gradient change that moves the bubble by one of these divisions. 2 mm (0.079 in) is the usual spacing for graduations; on a surveyor's level, the bubble will move 2 mm (0.079 in) when the vial is tilted about 0.005 degree. For a precision machinist level with 2 mm (0.079 in) divisions, when the vial is tilted one division, the level will change 0.04 mm (0.0016 in) one meter from the pivot point, referred to by machinists as 5 tenths per foot. This terminology is unique to machinists and indicates a length of 5 tenths
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level, which at this stage is of unknown accuracy. The spirit level is then rotated through 180 degrees in the horizontal plane, and another reading is noted. If the level is accurate, it will indicate the same orientation with respect to the horizontal plane. A difference implies that the level is inaccurate.
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Digital spirit levels are increasingly common in replacing conventional spirit levels, particularly in civil engineering applications such as traditional building construction and steel structure erection, for on-site angle alignment and leveling tasks. The industry practitioners often refer to those
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A traditional carpenter's spirit level looks like a short plank of wood and often has a wide body to ensure stability, and that the surface is being measured correctly. In the middle of the spirit level is a small window where the bubble and the tube is mounted. Two notches (or rings) designate where
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To check the accuracy of a carpenter's type level, a perfectly horizontal surface is not needed. The level is placed on a flat and roughly level surface and the reading on the bubble tube is noted. This reading indicates to what extent the surface is parallel to the horizontal plane, according to the
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A line level is a level designed to hang on a builder's string line. The body of the level incorporates small hooks to allow it to attach and hang from the string line. The body is lightweight, so as not to weigh down the string line, it is also small in size as the string line in effect becomes the
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in the tube. They have a slight upward curve, so that the bubble naturally rests in the center, the highest point. At slight inclinations the bubble travels away from the marked center position. Where a spirit level must also be usable upside-down or on its side, the curved constant-diameter tube is
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Sensitivity is an important specification for a spirit level, as the device's accuracy depends on its sensitivity. The sensitivity of a level is given as the change of angle or gradient required to move the bubble by unit distance. If the bubble housing has graduated divisions, then the sensitivity
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and going cross country (successive points being perhaps 100 meters (328 ft) apart) height differences can be measured cumulatively over long distances and elevations can be calculated. Precise levelling is supposed to give the difference in elevation between two points one kilometer (0.62
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The Fell All-Way precision level, one of the first successful American made bull's eye levels for machine tool use, was invented by William B. Fell of Rockford, Illinois in 1939. The device was unique in that it could be placed on a machine bed and show tilt on the x-y axes simultaneously,
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Adjustment of the spirit level is performed by successively rotating the level and moving the bubble tube within its housing to take up roughly half of the discrepancy, until the magnitude of the reading remains constant when the level is flipped.
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An engineer's precision level permits leveling items to greater accuracy than a plain spirit level. They are used to level the foundations, or beds of machines to ensure the machine can output workpieces to the accuracy pre-built in the machine.
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and is a matter of course each time the instrument is set up. In this latter case, the plane of rotation of the instrument is levelled, along with the spirit level. This is done in two horizontal
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to measure height differences over larger distances. A surveyor's leveling instrument has a spirit level mounted on a telescope (perhaps 30 power) with cross-hairs, itself mounted on a
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glass face with a circle at the center. It serves to level a surface across a plane, while the tubular level only does so in the direction of the tube.
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in 1666. It is very likely that these levels were in use in France and elsewhere long before the turn of the century.
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with constant inner diameter at each viewing point. These vials are filled, incompletely, with a liquid – usually a
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eliminating the need to rotate the level 90 degrees. The level was so accurate it was restricted from export during
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body; when the level is hung in the center of the string, each 'leg' of the string line extends the level's plane.
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the bubble should be if the surface is level. Often an indicator for a 45 degree inclination is included.
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replaced by an uncurved barrel-shaped tube with a slightly larger diameter in its middle.
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The history of the spirit level was discussed in brief in an 1887 article appearing in
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A similar procedure is applied to more sophisticated instruments such as a surveyor's
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Today level tools are available in most smartphones by using the device's
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Carpenter's level (either wood, aluminium or composite materials)
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There are different types of spirit levels for different uses:
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Early tubular spirit levels had very slightly curved glass
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Measuring elevation with a line level and measuring tape.
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take "levels of the Thevenot type" on its expedition to
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International Federation of Building and Wood Workers
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Modern automatic level in use on a construction site
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are often used rather than water. Alcohols have low
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Tool to indicate whether a surface is level or plumb
2739: 2688: 2632: 2546: 2496: 2453: 2325: 2318: 2206: 2093: 2035: 1845: 1788: 1459: 1378: 1369: 1193: 1162: 205:). Different types of spirit levels may be used by 67:. Unsourced material may be challenged and removed. 715:"Sensitivity & Accuracy of Spirit Level Vials" 569:miles) apart correct to within a few millimeters. 422:Level tool being used to establish horizontality. 731:. Sli.unimelb.edu.au. 1998-10-19. Archived from 473:A spirit level is usually found on the head of 663:. Munn & Company. 1887-08-27. p. 136. 1140: 791: 8: 353:A variant of the linear spirit level is the 2322: 1851: 1375: 1147: 1133: 1125: 798: 784: 776: 676:"Machinist's precision level (US2316777A)" 175:designed to indicate whether a surface is 127:Learn how and when to remove this message 2655:Building and Wood Workers' International 556:. These leveling instruments as used in 650: 7: 2790: 225:and other metalworkers, and in some 65:adding citations to reliable sources 2780: 2640:American Association of Woodturners 754:"How do I access the spirit level?" 523: 14: 2831:Woodworking measuring instruments 2670:National Wood Carvers Association 542:Combining a spirit level with an 217:, other building trades workers, 2789: 2779: 2770: 2769: 2645:Architectural Woodwork Institute 514: 41: 52:needs additional citations for 2650:British Woodworking Federation 524:Surveyor's leveling instrument 1: 2660:Caricature Carvers of America 674:William B Fell (1940-08-01). 187:). Two basic designs exist: 32:Spirit level (disambiguation) 849:Coordinate-measuring machine 277:AcadĂ©mie Royale des Sciences 615:Glossary of levelling terms 515:Engineer's precision levels 489:Carpenter's bulls-eye level 2847: 527: 453:Engineer's precision level 303:Machinists precision level 155:mounted in a camera tripod 29: 18: 2765: 2675:Society of Wood Engravers 1854: 1047: 814: 729:"Equipment Database Menu" 410:1 thousandth of an inch. 275:had recommended that the 1088:Machine and metalworking 1098:Measuring and alignment 640:Turn and bank indicator 620:Horizontal and vertical 295:Design and construction 153:bull's eye spirit level 2752:Frameless construction 1833:Wood-plastic composite 577:Alternatives include: 539: 507: 490: 464:Slip or Skid Indicator 443: 423: 374: 304: 156: 144: 143:A tubular spirit level 537: 505: 488: 480: 441: 421: 372: 302: 249:MelchisĂ©dech ThĂ©venot 150: 142: 2680:Timber Framers Guild 1534:Australian Blackwood 1063:Cutting and abrasive 899:Laser measuring tool 61:improve this article 30:For other uses, see 2400:Hammer-headed tenon 1919:Janka hardness test 809:and alignment tools 717:. 13 December 2022. 703:. 24 November 2021. 660:Scientific American 475:combination squares 244:Scientific American 1261:Japanese carpentry 1009:Thread pitch gauge 839:Combination square 540: 530:Level (instrument) 508: 491: 444: 424: 375: 305: 253:Christiaan Huygens 157: 145: 2803: 2802: 2757:Green woodworking 2614:Wood preservation 2542: 2541: 2445:Tongue and groove 2425:Mortise and tenon 2314: 2313: 2012:Warrington hammer 1841: 1840: 1529:African Blackwood 1321:Segmented turning 1122: 1121: 819:Architect's scale 544:optical telescope 481:Carpenter's level 330:Alcohols such as 137: 136: 129: 111: 2838: 2793: 2792: 2783: 2782: 2773: 2772: 2323: 1992:Thickness planer 1852: 1646:(lime, basswood) 1376: 1236:Chainsaw carving 1149: 1142: 1135: 1126: 894:Laser line level 864:Engineer's scale 859:Drafting machine 800: 793: 786: 777: 766: 765: 763: 761: 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1417: 1414: 1412: 1409: 1407: 1404: 1401: 1400: 1395: 1394: 1389: 1386: 1385: 1383: 1381: 1377: 1374: 1372: 1368: 1362: 1359: 1357: 1354: 1352: 1349: 1347: 1344: 1342: 1339: 1337: 1334: 1332: 1329: 1327: 1324: 1322: 1319: 1317: 1314: 1312: 1309: 1307: 1304: 1302: 1299: 1297: 1294: 1292: 1289: 1287: 1284: 1282: 1279: 1277: 1274: 1272: 1269: 1267: 1264: 1262: 1259: 1257: 1254: 1252: 1249: 1247: 1244: 1242: 1239: 1237: 1234: 1232: 1229: 1227: 1224: 1222: 1219: 1217: 1214: 1212: 1209: 1207: 1206:Bow and arrow 1204: 1202: 1201:Boat building 1199: 1198: 1196: 1192: 1185: 1181: 1178: 1176: 1173: 1171: 1168: 1167: 1165: 1161: 1157: 1150: 1145: 1143: 1138: 1136: 1131: 1130: 1127: 1114: 1111: 1109: 1106: 1104: 1101: 1099: 1096: 1094: 1091: 1089: 1086: 1084: 1081: 1079: 1076: 1074: 1071: 1069: 1066: 1064: 1061: 1059: 1056: 1054: 1051: 1050: 1046: 1040: 1037: 1035: 1032: 1030: 1027: 1025: 1022: 1020: 1019:Vernier scale 1017: 1015: 1012: 1010: 1007: 1005: 1002: 1000: 997: 995: 992: 990: 987: 985: 982: 980: 977: 975: 972: 970: 967: 965: 962: 960: 957: 955: 952: 950: 947: 945: 942: 940: 937: 935: 932: 930: 927: 925: 922: 920: 917: 915: 914:Measuring rod 912: 910: 909:Marking gauge 907: 905: 902: 900: 897: 895: 892: 890: 887: 885: 882: 880: 877: 875: 872: 870: 867: 865: 862: 860: 857: 855: 852: 850: 847: 845: 842: 840: 837: 835: 832: 830: 827: 825: 822: 820: 817: 816: 813: 808: 801: 796: 794: 789: 787: 782: 781: 778: 771: 755: 749: 746: 734: 730: 724: 721: 716: 710: 707: 702: 696: 693: 681: 677: 670: 667: 662: 661: 654: 651: 645: 641: 638: 636: 633: 631: 628: 626: 623: 621: 618: 616: 613: 612: 608: 606: 602: 600: 599:accelerometer 593: 590: 588: 585: 583: 580: 579: 578: 572: 570: 567: 563: 559: 555: 554: 549: 548:tilting level 546:results in a 545: 536: 531: 521: 512: 504: 497: 495: 487: 478: 476: 469: 466: 463: 461: 458: 455: 452: 449: 446: 442:Torpedo level 440: 435: 433:Mason's level 432: 429: 428: 427: 420: 413: 411: 409: 400: 398: 396: 395:perpendicular 392: 388: 387:optical level 383: 379: 371: 364: 362: 360: 356: 351: 349: 345: 341: 337: 333: 328: 325: 321: 317: 314: 310: 301: 294: 292: 290: 284: 282: 278: 274: 273:Adrien Auzout 270: 266: 262: 258: 254: 250: 246: 245: 236: 234: 232: 228: 224: 220: 216: 212: 208: 204: 200: 199: 194: 190: 186: 182: 178: 174: 170: 166: 162: 154: 149: 141: 131: 128: 120: 109: 106: 102: 99: 95: 92: 88: 85: 81: 78: â€“  77: 73: 72:Find sources: 66: 62: 56: 55: 50:This article 48: 44: 39: 38: 33: 26: 22: 2564:Heat bending 2509:Edge banding 2281:Router plane 2276:Rebate plane 2236:Finger plane 1967: 1671: 1665: 1645: 1639:Lignum vitae 1397: 1391: 1356:Wood carving 1331:Shipbuilding 1316:Root carving 1276:Log building 1241:Chip carving 999:Tape measure 984:Straightedge 974:Steel square 969:Spirit level 968: 964:Speed square 939:Radius gauge 904:Lesbian rule 874:French curve 824:Beam compass 758:. Retrieved 748: 737:. Retrieved 733:the original 723: 709: 695: 683:. Retrieved 669: 659: 653: 625:Inclinometer 603: 596: 576: 573:Alternatives 551: 547: 541: 518: 509: 492: 472: 460:Inclinometer 425: 407: 404: 397:directions. 384: 380: 376: 352: 329: 322:– leaving a 306: 289:World War II 285: 257:Robert Hooke 242: 240: 231:videographic 227:photographic 202: 196: 192: 188: 168: 165:bubble level 164: 161:spirit level 160: 158: 123: 114: 104: 97: 90: 83: 71: 59:Please help 54:verification 51: 2785:WikiProject 2731:Rift sawing 2721:Flat sawing 2609:Wood drying 2286:Scrub plane 2271:Razee plane 2221:Block plane 2075:Mitre clamp 2022:Wood scribe 1973:Combination 1715:Purpleheart 1411:Douglas fir 1361:Woodturning 1194:Occupations 1156:Woodworking 1113:Woodworking 889:Laser level 869:Flat spline 756:. iPhoneFAQ 592:Water level 553:dumpy level 401:Sensitivity 365:Calibration 348:fluorescein 223:millwrights 215:bricklayers 211:stonemasons 179:(level) or 2810:Categories 2740:Techniques 2689:Conversion 2619:Wood stain 2547:Treatments 2335:Birdsmouth 2301:Spokeshave 2251:Jack plane 2241:Fore plane 2080:Pipe clamp 2045:Band clamp 1969:Carpenters 1790:Engineered 1740:Rubberwood 1589:Eucalyptus 1393:Calocedrus 1306:Pyrography 1271:Kohlrosing 1014:Try square 1004:Theodolite 949:Set square 934:Protractor 924:Micrometer 919:Meterstick 834:Chalk line 739:2009-07-29 646:References 635:Theodolite 582:Reed level 498:Line level 450:Line level 447:Post level 391:theodolite 281:Madagascar 207:carpenters 198:bull's eye 177:horizontal 173:instrument 87:newspapers 2816:Surveying 2529:Parquetry 2524:Oystering 2519:Marquetry 2360:Butterfly 2027:Workbench 1959:Sandpaper 1939:Mitre box 1884:Drawknife 1874:Burnisher 1859:Abrasives 1808:Hardboard 1469:Afromosia 1351:Whittling 1301:Parquetry 1286:Marquetry 1231:Certosina 1226:Carpentry 1216:Cabinetry 1163:Overviews 929:Plumb-bob 807:Measuring 630:Plumb bob 566:elevation 558:surveying 336:viscosity 219:surveyors 117:July 2009 21:surveying 2775:Category 2554:Adhesive 2534:Purfling 2514:Intarsia 2455:Profiles 2380:Dovetail 2319:Geometry 2158:Hand saw 2143:Crosscut 2128:Circular 2123:Chainsaw 2070:Holdfast 1735:Rosewood 1667:American 1662:Mahogany 1634:Jelutong 1604:Hornbeam 1569:Cocobolo 1564:Chestnut 1479:Andiroba 1291:Millwork 1256:Intarsia 1251:Fretwork 1246:ÉbĂ©niste 1175:Glossary 1068:Forestry 1058:Cleaning 994:T-square 829:Calipers 760:2 August 685:2 August 609:See also 346:such as 344:colorant 269:Florence 203:circular 181:vertical 171:, is an 19:For the 2821:Geodesy 2795:Commons 2711:Whipsaw 2706:Sawmill 2599:Varnish 2594:Thermal 2569:Lacquer 2504:Binding 2473:Chamfer 2340:Biscuit 2306:Surform 2198:Whipsaw 2168:Keyhole 2153:Fretsaw 2133:Compass 2118:Bucksaw 2108:Bandsaw 2103:Backsaw 2085:Sawbuck 2055:F-clamp 2050:C-clamp 1924:Jointer 1828:Plywood 1780:Zebrano 1720:Ovankol 1685:Meranti 1673:African 1644:Linden 1599:Hickory 1554:Cedrela 1549:Camphor 1544:Bubinga 1539:Boxwood 1519:Bilinga 1504:Avodire 1421:Juniper 1406:Cypress 1281:Luthier 1170:History 1093:Masonry 1083:Kitchen 1034:Wiggler 979:Stencil 954:Skirret 844:Compass 332:ethanol 320:alcohol 313:colored 237:History 189:tubular 101:scholar 2701:Hewing 2440:Splice 2395:Halved 2390:Groove 2385:Finger 2365:Coping 2350:Bridle 2327:Joints 2208:Planes 2193:Veneer 2183:Scroll 2178:Ripsaw 2163:Jigsaw 2138:Coping 2037:Clamps 1964:Square 1954:Shaper 1949:Router 1929:Mallet 1904:Gimlet 1879:Chisel 1775:Willow 1765:Walnut 1755:Totara 1745:Sapele 1710:Poplar 1695:Padauk 1657:Merbau 1629:Jarrah 1614:Imbuia 1609:Idigbo 1574:Cumaru 1559:Cherry 1484:Anigre 1446:Spruce 1399:Cedrus 1266:Khatam 1221:Caning 1184:lumber 1103:Mining 1073:Garden 989:Square 562:tripod 359:convex 324:bubble 316:spirit 261:London 233:work. 195:) and 193:linear 103:  96:  89:  82:  74:  2579:Paint 2488:Ovolo 2483:Ogive 2468:Bevel 2435:Scarf 2420:Miter 2188:Table 2173:Miter 2148:Frame 2065:Gripe 1981:Speed 1977:Miter 1909:Gauge 1899:Float 1894:Fence 1889:Drill 1847:Tools 1770:Wenge 1760:Utile 1725:Ramin 1680:Maple 1652:Lovoa 1624:Iroko 1594:Hazel 1579:Ebony 1524:Birch 1514:Beech 1509:Balsa 1499:Aspen 1494:Apple 1474:Alder 1431:Kauri 1426:Larch 1388:Cedar 1371:Woods 1346:Treen 1108:Power 944:Ruler 414:Types 389:or a 309:vials 185:plumb 169:level 108:JSTOR 94:books 2478:Ogee 2463:Bead 2405:Knee 2375:Dado 2355:Butt 2095:Saws 2007:Vise 1944:Rasp 1869:Adze 1750:Teak 1705:Plum 1700:Pear 1461:Hard 1441:Rimu 1436:Pine 1380:Soft 1180:Wood 1078:Hand 1024:Vise 762:2018 687:2018 338:and 263:and 201:(or 191:(or 80:news 2604:Wax 2574:Oil 2410:Lap 2345:Box 2113:Bow 1985:Try 1864:Axe 1818:OSB 1813:MDF 1690:Oak 1619:IpĂŞ 1584:Elm 1489:Ash 1451:Yew 1416:Fir 884:Jig 550:or 318:or 267:in 259:in 229:or 63:by 2812:: 1983:, 1979:, 1975:, 1971:, 1670:, 1396:, 678:. 477:. 408:of 247:. 221:, 213:, 209:, 163:, 159:A 151:A 1988:) 1966:( 1676:) 1664:( 1402:) 1390:( 1186:) 1182:( 1148:e 1141:t 1134:v 799:e 792:t 785:v 764:. 742:. 689:. 183:( 130:) 124:( 119:) 115:( 105:· 98:· 91:· 84:· 57:. 34:. 27:.

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bull's eye spirit level
instrument
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vertical
plumb
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carpenters
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