US575105A - Plan i meter - Google Patents
Plan i meter Download PDFInfo
- Publication number
- US575105A US575105A US575105DA US575105A US 575105 A US575105 A US 575105A US 575105D A US575105D A US 575105DA US 575105 A US575105 A US 575105A
- Authority
- US
- United States
- Prior art keywords
- upright
- edge
- point
- ring
- meter
- 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
- 238000010586 diagram Methods 0.000 description 2
- 230000001771 impaired Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000036633 rest 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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/26—Measuring arrangements characterised by the use of mechanical techniques for measuring areas, e.g. planimeters
Definitions
- Figure I illustrates a perspective view thereof.
- Fig. II illustrates a diagram showing the various positions of the parts during the measurement of a surface.
- 1 is the horizontal portionof the planimeing in a point, said point being adapted to trace the boundaries of the surface to be measured.
- 3 is the second perpendicular portion of the instrument, being in the same plane as the other portions and terminating in a flat knifeedge, the said edge being in the plane of the portions 1, 2, and 3.
- the circle 8 incloses the area to be ascertained.
- the edge. 7 will fall upon the place 7 as shown in Fig. II.
- the point of 2 is then moved down the radius r to the circumference.
- the supporting-ring 5 will then be in the position shown at 9, while the center of edge 7, which has been allowed to swing freely, will be at 9.
- the point 2 being traced over the circumference, as shown by the arrow, causes the ring 5 to take, consecu-
- the edge 7 beingin the meantime allowed to I travel freely will be in the positions 1O 11 12.
- the edge 7 will be at 13.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Knives (AREA)
Description
(No Model.)
-B. E.OHOLLA R PLANIMETER.
Patented Jan. 12, 1897.
as co. woroumo. WASHXNGTON. u c.
I reference being had to the accompanying which-- ter; 2, the perpendicular portion, terminattively, the positions shown at 10, 11, and 12.
v UNITED STATES ATEN'I FFICE.
BYRON E. CHOLLAR, OF ST. LOUIS, MISSOURI.
PLANIMETER.
SPECIFICATION forming part of Letters Patent No. 575,105, dated January 12, 1897. I Application filed July 16, 1896. Serial No. 599,371; (No model.)
To all whont it may concern:
Be it known that I, BYRON E. CHOLLAR, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Planimeters, of which the following is a full, clear, and exact description,
drawings, forming part of this specification. My invention relates to an improvement in instruments for ascertaining the area of irregular plane surfaces. I am aware that the instrument itself is old, but my invention relates to an improved attachment therefor.
The device is shown in the drawings, in
Figure I illustrates a perspective view thereof. Fig. II illustrates a diagram showing the various positions of the parts during the measurement of a surface.
1 is the horizontal portionof the planimeing in a point, said point being adapted to trace the boundaries of the surface to be measured.
3 is the second perpendicular portion of the instrument, being in the same plane as the other portions and terminating in a flat knifeedge, the said edge being in the plane of the portions 1, 2, and 3.
4 is a sleeve adapted to fit over and support the upright 2.
5 is a ring attached to the sleeve 4 by means of the braces 6.
7 is a knife-edge in line with point 2 and provided with a cut at its point of contact and situated on the end of upright 3.
For the purpose of illustrating the use of my invention we will assume that the circle 8 incloses the area to be ascertained. By placing the pointed end of 2 in the center of this circle the edge. 7 will fall upon the place 7 as shown in Fig. II. The point of 2 is then moved down the radius r to the circumference. The supporting-ring 5 will then be in the position shown at 9, while the center of edge 7, which has been allowed to swing freely, will be at 9. The point 2 being traced over the circumference, as shown by the arrow, causes the ring 5 to take, consecu- The edge 7 beingin the meantime allowed to I travel freely will be in the positions 1O 11 12. When the point has returned to the end of the radius r, the edge 7 will be at 13. Then the point 2 is traced back up the radius r to the center, at which place it will be found that the edge 7 rests at 14. The distance from 14 to 7, the place of starting, multiplied by the distance from point 2 to the point of contact of edge 7 will give the area thereof. Formerly the bent wire 1 2 3 was all that was used. As great care and exactness are required, the necessary freedom of the loose end 7 was impaired by the handling of the device. The pointed end 2 must exactly trace the boundary of the surface, while the end 7 must be allowed to move freely. Holding the instrument in the hand prevented this. I have therefore provided the collar 4, through which the pointed end 2 plays, supported by braces from a fiat ring 5. The ring 5 is large enough to expose the pointed end 2 to ones view. The collar 4 holds the instrument upright, and the braces 6 afford a convenient means for holding or moving the device. By its use accurate results may be obtained with an case that has not before been possible.
What I claim, and desire to secure by Letters Patent, is-
l. The combination with a planimeter, of a frame adapted to seat on the surface to be traced whereby the pointed upright of the planimeter is supported in contact with the said surface; substantially as described.
2. The combination of a pointed upright, a knife-edge upright, and a connection between the two, a collar adapted to support said pointed upright, and a horizontal ring secured to said collar by means of braces, substantially as described.
3. The combination of tracing-upright 2, knife-edge upright 3, and connection 1, all made integral, with supporting-collar 4 adapted to receivesaid tracing-upright 2, horizontal ring 5, and braces 6, likewise made integral, substantially as described.
BYRON E. CHOLLAR.
Publications (1)
Publication Number | Publication Date |
---|---|
US575105A true US575105A (en) | 1897-01-12 |
Family
ID=2643797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US575105D Expired - Lifetime US575105A (en) | Plan i meter |
Country Status (1)
Country | Link |
---|---|
US (1) | US575105A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2495675A (en) * | 1945-11-29 | 1950-01-24 | Porges | Planimeter |
US3110967A (en) * | 1962-04-12 | 1963-11-19 | Wiley Hugh | Planimeter device |
-
0
- US US575105D patent/US575105A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2495675A (en) * | 1945-11-29 | 1950-01-24 | Porges | Planimeter |
US3110967A (en) * | 1962-04-12 | 1963-11-19 | Wiley Hugh | Planimeter device |
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