US155327A - Improvement in sun-dials - Google Patents
Improvement in sun-dials Download PDFInfo
- Publication number
- US155327A US155327A US155327DA US155327A US 155327 A US155327 A US 155327A US 155327D A US155327D A US 155327DA US 155327 A US155327 A US 155327A
- Authority
- US
- United States
- Prior art keywords
- sun
- dials
- improvement
- dial
- arms
- 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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Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B49/00—Time-pieces using the position of the sun, moon or stars
- G04B49/02—Sundials
Definitions
- the invention relates to a novel construction and notation of dial, by which the correct time of day may be exhibited by the sun in a position inclined toward, and convenient to, the passer-by on the streets and thoroughfares of cities and towns, enabling all, without dificulty or delay, to perceive the solar time.
- A represents a cross iitted in a suitable socket, block, or bracket, and inclined at such an angle to a horizontal plane as corresponds with the degree of latitude in which the locality of the dial may be situated.
- B O D E are the four arms of cross, of which the three former are provided with hemispherical concavities B' O' D', quadrautally divided by partitions b c d.
- the division b will throw a shadow on the left side of concavity B', and the arm B on the right side ot the arm C. This will graduallyr withdraw,on the scales c1 bl, in the direction of the division b and the intersection of arms C B until six o'clock,
- dial-scales cl d2 e2 b3 e3 c4 are fractional, and together make up the days notation, while the two opposite concave scales make a perfect dial, and the middle-arm scale (side and concave) another.
- a sun-dial made iu the shape of a cross, B O D E, having partitioned end concavities B' C' D', in three of the arms, and a system of timescales, b1 c1 b2 c2 d2 e2 b3 c3 d3 c3 c4 d, arranged as shown and described.
- Adial having' three concavities on the ends of cross-arms, with diametrical partitions, arranged and notated as and for the purpose specified.
Description
UNITED STATES PATENT OEEIGE.
GEORGE MEHR, OF PHILADELPHIA, PENNSYLVANIA.
IMPROVEMENT IN SUN-DIALS.
Specification forming part of Letters Patent No.155,327, dated September 22, 1874; application filed May 22, 1874.
description of the same, reference being had Y to the accompanying drawing, forming a part of this specification, in which- Figure l is a perspective view 5 Fig. 2, a side, and Fig. 3 a front, elevation.
The invention relates to a novel construction and notation of dial, by which the correct time of day may be exhibited by the sun in a position inclined toward, and convenient to, the passer-by on the streets and thoroughfares of cities and towns, enabling all, without dificulty or delay, to perceive the solar time.
A represents a cross iitted in a suitable socket, block, or bracket, and inclined at such an angle to a horizontal plane as corresponds with the degree of latitude in which the locality of the dial may be situated. B O D E are the four arms of cross, of which the three former are provided with hemispherical concavities B' O' D', quadrautally divided by partitions b c d.
As the sun rises, the division b will throw a shadow on the left side of concavity B', and the arm B on the right side ot the arm C. This will graduallyr withdraw,on the scales c1 bl, in the direction of the division b and the intersection of arms C B until six o'clock,
when it will disappear. Reappearing on the right of division b and the left of division c, it will advance up the scales b2 c2 e3, and, after nine oclock, up the sca-le d2, until the sun attains its meridian, when all shadows will again disappear. As the sun declines, the shadow of division c d and of arms D O will pass over the sca-les or dials o3 d3 e3 b3. At six oelock the shadow will again momentarily disappear, and then, resuming its course, pass over the dial-scales c4 d4.
It will be observed that the dial-scales cl d2 e2 b3 e3 c4 are fractional, and together make up the days notation, while the two opposite concave scales make a perfect dial, and the middle-arm scale (side and concave) another.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-
1. A sun-dial made iu the shape of a cross, B O D E, having partitioned end concavities B' C' D', in three of the arms, and a system of timescales, b1 c1 b2 c2 d2 e2 b3 c3 d3 c3 c4 d, arranged as shown and described.
2. Adial having' three concavities on the ends of cross-arms, with diametrical partitions, arranged and notated as and for the purpose specified.
GEO. MEHR.
Witnesses:
SoLoN C. KEMON, EDWD. BENTON.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US155327A true US155327A (en) | 1874-09-22 |
Family
ID=2224737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US155327D Expired - Lifetime US155327A (en) | Improvement in sun-dials |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US155327A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181324A (en) * | 1989-04-28 | 1993-01-26 | Piet Hein A/S | Sundial |
-
0
- US US155327D patent/US155327A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181324A (en) * | 1989-04-28 | 1993-01-26 | Piet Hein A/S | Sundial |
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