The clock has ample power and is enclosed in a heavy case which protects it from dust and injury. It is driven by two strong springs and will run about 12 hours without rewinding. A lever for starting or stopping is provided. Motion from clock to polar axis is transmitted by means of a set of bevel gears and worm and worm wheel. The worm wheel is held by friction to the polar axis so that the telescope can be moved without loosening any screw and without affecting the clock. The clock will give steady and accurate motion to the telescope and with ordinary care it will keep in good repair for years. A slow motion adjustment independent of the clock is fitted to the polar axis. With the instrument are furnished three celestial eye pieces giving a magnifying power of about 50, 100 and 150 diameters respectively. The instrument is easily portable, the total weight of a 3" telescope being about 60 lbs. yet it is made heavy enough, and the material well distributed to insure strength and steadiness. Workmanship and finish of the instrument are the best. The brass parts are either lacquered yellow or bronzed. The iron parts are durably enameled and all exposed steel parts are nickel-plated. #A120.# Telescope of 3" aperture. Price #$190.00# #A121.# Telescope of 3 1/2" aperture, the same as above but the bearing parts made proportionally heavier. Price #$240.00# #A122.# Telescope of 4" aperture. Price #$320.00# For accessories see page 11. #Note.#--An iron column can be provided for above telescopes in place of of the tripod, at an extra cost of $20.00. [Illustration: A 130] EQUATORIAL MOUNTINGS ON IRON PILLAR WITH DRIVING CLOCK, ETC. On page 10 is shown an illustration of our standard high grade type of 6 in. equatorial. A description of the same will apply to practically all larger and smaller sizes.