GB224258A - Improved level - Google Patents

Improved level

Info

Publication number
GB224258A
GB224258A GB1204923A GB1204923A GB224258A GB 224258 A GB224258 A GB 224258A GB 1204923 A GB1204923 A GB 1204923A GB 1204923 A GB1204923 A GB 1204923A GB 224258 A GB224258 A GB 224258A
Authority
GB
United Kingdom
Prior art keywords
tube
plane
axis
marks
lines
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
Application number
GB1204923A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THOMAS FRANCIS CONNOLLY
Original Assignee
THOMAS FRANCIS CONNOLLY
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by THOMAS FRANCIS CONNOLLY filed Critical THOMAS FRANCIS CONNOLLY
Priority to GB1204923A priority Critical patent/GB224258A/en
Publication of GB224258A publication Critical patent/GB224258A/en
Expired legal-status Critical Current

Links

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
    • G01C9/34—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 of the tubular type, i.e. for indicating the level in one direction only
    • 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
    • G01C9/26—Details
    • G01C9/32—Means for facilitating the observation of the position of the bubble, e.g. illuminating means

Abstract

224,258. Connolly, T. F. May 4, 1923. Levels. - In instruments employing a reversible bubble tube mounted on a rotatable telescope, to reduce the number of readings to be taken in ascertaining the true horizontal the tube is rotatably mounted about its longitudinal axis of symmetry so that rotation around this axis produces no movement of the air bell relatively to the tube. The tube 1 is mounted in adjustable bearings which are adjusted until rotation about the axis 4, 5 produces no movement of the air bell in relation to the central plane 7 of the tube. The tube is provided with graduations 8 equidistant from the plane 7 and these may be read by a prism device 9 of the kind described in Specification 17944/10. Fig. 3 shows a form of graduation comprising marks 12, 13 at equal distances from the plane 7 on one side and marks 14, 15 at different, but also equal, distances from the plane 7 on the other side. By providing a movable pointer in conjunction with the device 9 a single mark only is required. To avoid parallax errors, lines may be marked on the inner and outer surfaces of the bubble tube, these lines being brought into coincidence when reading the level.
GB1204923A 1923-05-04 1923-05-04 Improved level Expired GB224258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1204923A GB224258A (en) 1923-05-04 1923-05-04 Improved level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1204923A GB224258A (en) 1923-05-04 1923-05-04 Improved level

Publications (1)

Publication Number Publication Date
GB224258A true GB224258A (en) 1924-11-04

Family

ID=9997501

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1204923A Expired GB224258A (en) 1923-05-04 1923-05-04 Improved level

Country Status (1)

Country Link
GB (1) GB224258A (en)

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