US161392A - Improvement in protractors - Google Patents
Improvement in protractors Download PDFInfo
- Publication number
- US161392A US161392A US161392DA US161392A US 161392 A US161392 A US 161392A US 161392D A US161392D A US 161392DA US 161392 A US161392 A US 161392A
- Authority
- US
- United States
- Prior art keywords
- protractors
- improvement
- center
- arm
- alvin
- 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
- 230000000875 corresponding Effects 0.000 description 2
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/56—Gauges for measuring angles or tapers, e.g. conical calipers
- G01B3/563—Protractors
Definitions
- Figure 1 represents a plan
- Fig. 2 is a sectional side View taken through the linew 00.
- the graduated are or circle A has a fixed arm, B, whose base shall be a true line. from the center, and extending through the zero-point.
- On the said are or circle A I have one or more movable arms, (1, which travel thereon, and in order to secure accuracy in the set of the said arms I have the outer periphery of the are or circle made with an incline, as shown at D, which bears against a similar incline in the recess on the arm.
- the points of the movable arm or arms all verge to the center, but do not touch. It is designed to have one of the points provided with a raised piece, G, for the reception of a screw, H, with a fine point, which will mark the center. 7
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Steroid Compounds (AREA)
Description
ALVIN H. DODD, OF NEW YORK, N. Y.
IMPROVEMENT IN PROTRACTORS.
Specification forming part of Letters Patent No. 161,392, dated March 30, 1875; application filed January 18, 1875.
To all whom it may concern:
Be it known that I, ALVIN H. DODD, of the city, county, and State of New York, have invented a new and Improved Protractor, of which the following is a specification:
The invention will first be fully described, and then pointed out in the claim.
Figure 1 represents a plan; and Fig. 2 is a sectional side View taken through the linew 00.
Similar letters of reference indicate corresponding parts.
In the case here presented, the graduated are or circle A has a fixed arm, B, whose base shall be a true line. from the center, and extending through the zero-point. On the said are or circle A I have one or more movable arms, (1, which travel thereon, and in order to secure accuracy in the set of the said arms I have the outer periphery of the are or circle made with an incline, as shown at D, which bears against a similar incline in the recess on the arm. Thus, when the plate E is clamped by turning the thumb-screw F, it will bear down on the are A, and thus cause the arm 0 to be drawn closely to the inner periphery of the same.
The points of the movable arm or arms all verge to the center, but do not touch. It is designed to have one of the points provided with a raised piece, G, for the reception of a screw, H, with a fine point, which will mark the center. 7
Having thus described my invention, I claim as new and desire to secure by Letters Patent The protractor A, having bar B rigidly attached at one end and extending to the center thereof, in combination with the bar 0, adjustably attached to said protractor by clamp E and screw F, as shown and described.
ALVIN H. DODD.
Witnesses:
CHARLES H. NASH, T. B. MOSHER.
Publications (1)
Publication Number | Publication Date |
---|---|
US161392A true US161392A (en) | 1875-03-30 |
Family
ID=2230801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US161392D Expired - Lifetime US161392A (en) | Improvement in protractors |
Country Status (1)
Country | Link |
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US (1) | US161392A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2948965A (en) * | 1959-01-12 | 1960-08-16 | Hawksley & Sons Ltd | Measuring instrument |
US2966177A (en) * | 1959-03-17 | 1960-12-27 | Technicon Company Inc | Movable work carriers and saw guards mounted thereon for power operated saws |
US4004347A (en) * | 1974-03-19 | 1977-01-25 | Sarah Hesse | Graphics instrument |
US4611407A (en) * | 1983-01-13 | 1986-09-16 | Gorp Keith N Van | Pivot assembly |
US20040034385A1 (en) * | 1997-11-07 | 2004-02-19 | Paul Gilson | Embolic protection device |
US20050137689A1 (en) * | 2003-12-23 | 2005-06-23 | Sadra Medical, A Delware Corporation | Retrievable heart valve anchor and method |
US20050137693A1 (en) * | 2003-12-23 | 2005-06-23 | Haug Ulrich R. | Methods and apparatus for endovascularly replacing a patient's heart valve |
-
0
- US US161392D patent/US161392A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2948965A (en) * | 1959-01-12 | 1960-08-16 | Hawksley & Sons Ltd | Measuring instrument |
US2966177A (en) * | 1959-03-17 | 1960-12-27 | Technicon Company Inc | Movable work carriers and saw guards mounted thereon for power operated saws |
US4004347A (en) * | 1974-03-19 | 1977-01-25 | Sarah Hesse | Graphics instrument |
US4611407A (en) * | 1983-01-13 | 1986-09-16 | Gorp Keith N Van | Pivot assembly |
US20040034385A1 (en) * | 1997-11-07 | 2004-02-19 | Paul Gilson | Embolic protection device |
US20050137689A1 (en) * | 2003-12-23 | 2005-06-23 | Sadra Medical, A Delware Corporation | Retrievable heart valve anchor and method |
US20050137693A1 (en) * | 2003-12-23 | 2005-06-23 | Haug Ulrich R. | Methods and apparatus for endovascularly replacing a patient's heart valve |
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