US100821A - Improvement in hand indicator for showing the course of vessels - Google Patents
Improvement in hand indicator for showing the course of vessels Download PDFInfo
- Publication number
- US100821A US100821A US100821DA US100821A US 100821 A US100821 A US 100821A US 100821D A US100821D A US 100821DA US 100821 A US100821 A US 100821A
- Authority
- US
- United States
- Prior art keywords
- course
- vessels
- showing
- improvement
- hand indicator
- 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
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- 230000000875 corresponding Effects 0.000 description 2
- 238000006073 displacement reaction Methods 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
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/38—Testing, calibrating, or compensating of compasses
Definitions
- HORACE P HORACE P; TUTTLE, OR BROOKLi-m,A NEW YORK.
- Figure 1 represents a ⁇ plan or Vtop 'view of my. improved course-indicator.
- Figure 2 is a vertical section -of the same. Similar letters ot' ⁇ reference indicate corresponding parts.
- This invention relates to a new instrument by which the truecourseof a vessel, with regard to the valiations of the needle, can be readily ascertained.
- the invention consists in the combination of two pointers turning on the same pin. They are so vground and held together that they will both move simultaneously, so that when one isset the other will also move, unless held fast.
- A in the drawing, represents a dial-plate, on ywhich d the several points of' the ⁇ compassare marked.
- a projecting pin,'a In its center is arranged a projecting pin,'a, upon ⁇ which two hands or pointers, B'C, are fitted, they be-- ing held down by a screw,- l).
- the device is used as follows: ⁇ i
- the upper hand O is set on the dial-plate, to ⁇ indi- 'l f cate the course, according to compass, of the vessel,
- the lower hand B is then placed over. zero, to point toward north.
- the two hands were movedseparately to the two positions shown in the drawing, and the one not moved was held fast, While the other was set.
- the hand B is shifted as far toward east or west as the needle of the compass may vary at the, place where the ship is situated.
- the" ha'nd C will also be carried in the same direction, and will then indicate the proper direction, according to the needle.
Description
H. P. 11111115.l
Compass.
No. 100,821. f rammed March 1 5, 1870,
L marasma f @sind iiiif.
HORACE P; TUTTLE, OR BROOKLi-m,A NEW YORK.
. Leners PamNo. 100,821, daad March 15, 1870.
IMROVMENT IN"` HAND INDICATOR FOR- SHOWING- THE COURSE OI' VESSELS.
The Schedule referred. to in these Letters Patent and making'part' ofthe same To all whom it mag/concern mi,
Be it known that l, HORACE I?. TUTTLE, of Brookf lyn, in the county of Kings, and State of Newl York, have invented a new and improved Course-Indicator for Vessels; and I do hereby declare that the followfing is a inll, clear, and exact description thereof, which will enable' others skilled in the art to make and use `the same, reference being had to the accompanying drawings forming part of this specification. Figure 1 represents a` plan or Vtop 'view of my. improved course-indicator. 3 l x Figure 2 is a vertical section -of the same. Similar letters ot'` reference indicate corresponding parts.
,This invention relates to a new instrument by which the truecourseof a vessel, with regard to the valiations of the needle, can be readily ascertained.
`. The invention consists in the combination of two pointers turning on the same pin. They are so vground and held together that they will both move simultaneously, so that when one isset the other will also move, unless held fast.
A, in the drawing, represents a dial-plate, on ywhich d the several points of' the `compassare marked.
In its center is arranged a projecting pin,'a, upon `which two hands or pointers, B'C, are fitted, they be-- ing held down by a screw,- l).
` Their contiguous surfaces, immediately around the pin a,fare` ground together, and the pressure upon' them by the screw is sniiicient `to cause them to move together. i v
The device is used as follows:` i
The upper hand O is set on the dial-plate, to `indi- 'l f cate the course, according to compass, of the vessel,
giving the requisite margin for any displacement by wind,currents, &c. The lower hand B is then placed over. zero, to point toward north. The two hands were movedseparately to the two positions shown in the drawing, and the one not moved was held fast, While the other was set. Now, in order to find the actual course, the hand B is shifted as far toward east or west as the needle of the compass may vary at the, place where the ship is situated. By such motion the" ha'nd C will also be carried in the same direction, and will then indicate the proper direction, according to the needle. v
' Thus, if a ship should steer ESE., with a strong easterly wind causingit to go SE. in a place where the needle varies two degrees toward W., the true Acourse will be two degrees S. of SE.
By this device the mistakes frequentlyV made by captains, in trying to nd the true course, are overcome. VVheu a ship steers in a southerlyl direction, men will often calculate the course to be more toward west, when the needle varies toward the west, while such variation shows a diierence of the course toward east.
Having thus described my invention, l 4 I claim as new and desire to secure by Lett-ers Patent- A coursefindicator, consisting of a dial-plate havin g.
the several points of the compass marked thereon, projecting pin a, pointers B C, and screw b, all adjuste and operated as set forth, and for thepurpose specified.
f H. P. TUTTLE. Witnesses F. H. DODGE, Oms. D. DUNTOX.
Publications (1)
Publication Number | Publication Date |
---|---|
US100821A true US100821A (en) | 1870-03-15 |
Family
ID=2170287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US100821D Expired - Lifetime US100821A (en) | Improvement in hand indicator for showing the course of vessels |
Country Status (1)
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US (1) | US100821A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2544441A (en) * | 1948-04-05 | 1951-03-06 | Baldock Charles Wesley | Sextant attachment |
US8296960B1 (en) * | 2011-07-13 | 2012-10-30 | Fenix Outdoor AB | Compass with improved reading precision |
-
0
- US US100821D patent/US100821A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2544441A (en) * | 1948-04-05 | 1951-03-06 | Baldock Charles Wesley | Sextant attachment |
US8296960B1 (en) * | 2011-07-13 | 2012-10-30 | Fenix Outdoor AB | Compass with improved reading precision |
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