Sidereal time compensation device for astronomical telescope

Details Sidereal time compensation device for astronomical telescope Sidereal time compensation device for astronomical telescope

1980-04-07

1982-03-02

Henry, Jon W.

G02B 2316

Patent

active

043176127

ABSTRACT:
An astronomical telescope having a polar axle for rotating the telescope about the polar axis at a predetermined speed and having sidereal time indicating means mounted on said axle and a pointer mounted adjacent to said means to indicate the rotational position of said axle with respect to said pointer. A sidereal time compensating device is mounted on the telescope and comprises a motor for rotation with said axle about the polar axis and gear means coupled to the sidereal time indicating means. The motor is engageable with the gear means to cause the gear means to rotate the time indicating means at a predetermined speed but in the opposite rotational direction as the rotation of the polar axle, whereupon the time indicating means remains at a fixed rotational position with respect to the pointer. The motor is arranged to be disabled so that when the gear means are engaged but the motor disabled, the rotation of the polar axle causes the concomitant rotation of the sidereal time indicating means. When the motor is disengaged from the gear means, the sidereal time indicating means can be adjusted to any rotational position with respect to the polar axle.

REFERENCES:
patent: 2326552 (1943-08-01), Morse
patent: 2711589 (1955-06-01), Stock
patent: 2896476 (1959-07-01), Williams
patent: 2995972 (1961-08-01), Baalson
patent: 3052986 (1962-09-01), Mechant
patent: 3136388 (1964-06-01), Jolly
patent: 3951511 (1976-04-01), Parsons
patent: 4050318 (1977-09-01), Wolf

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