DE54282C - Clock for immediate reading of the local time on a specific meridian - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The device shown in the accompanying drawing, which is intended to enable the local time to be read on a certain meridian at any given moment, consists of a peculiar dial A with a ring b on the outside and a ring-shaped groove in which two rings B can be attached to any clock and B ^{J are} rotatable. The ring B is in the usual way in hours from ο to 12 (or from ο to 24), the ring B ¹ in minutes, i.e. from ο to 60, the inner ring of the fixed dial A corresponding to the number of hours of the ring B in i8o ° respectively 360 ⁰ and the ring b finally divided into degree-minutes, wherein in the present case, each minute of Tlieilung b a distance of 1 5 geographical miles corresponds. The rings B and B ¹ are best moved by a button C * by means of the gear wheels DE sitting on the shaft C , which each mesh with a ring gear on the lower side of these rings.

While the wheel D on its entire circumference z. B. is toothed in such a way that the ring B ¹ also makes one revolution with each revolution of the wheel D , the wheel E has only one tooth, which moves the ring by an hour division with each revolution. These two rings B and B ¹ , which accordingly rotate in the same proportion as the hour and minute hands, are aligned with the aid of button C 'in such a way that the zero point of the same or the partial lines XII and 60 with the zero point of the partial circles α and b respectively. the division marks 180 and 15 coincide, and then the two hands of the clock are set exactly to the local time of Ferro, respectively. for sea service to that of Greenwich. If one now wants to know the local time of any point at any given moment, one only has to set the rings B and B ¹ with the aid of the button C ^{1 in} such a way that the zero point of the same resp. the division mark XII coincides exactly with that degree of the division circle α which corresponds to the meridian of the place in question, and then the hands - provided that the clock is running correctly - point to the rings B and B ¹ in the new position of the same exactly the local time of the meridian concerned respectively. of a point of the same.

If one moves from any particular point in a westerly direction, then the rings B and B ^{1 are} to be rotated from left to right, in contrast to a change of location to the east, conversely, from right to left.

Conversely, if one wants to determine for any purpose in which meridian the sun is at a certain moment, one simply has to set the rings B and B ¹ to the zero points of the partial circles α and b , and the small pointer then points to the The partial circle α directly indicates the relevant degree and the larger hand on the partial circle b indicates the minutes.

Claims (1)

Patent Claims: Device on clocks for the immediate reading of the local time of a certain meridian by means of the hands of the clock, consisting of a fixed dial A with degree graduation α (from ο to 180 or 360) and an outer ring b with degree minute graduation (from 0 to 15), between which a ring (B) with hourly increments (from ο to 12 or 24) and a second ring B ¹ with time increments of minutes (from ο to 60) can be rotated.
2. In connection with the device referred to in claim 1 on clocks a device for adjusting the rings (B and .By by means of the wheels D and E in a ratio of 1 to 12. For this purpose ι sheet of drawings.