. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . scribed below in his own words. The eye end, suitable for heavyspectroscopes, &c., is fitted to the butt end of the telescope bybayonet jomts and tightening screws, so that it can be exchangedfor a micrometric eye end with almost as little trouble as the ex-changing of an eye-piece. The illumination of the circles and themicrometer is by electric incandescent lamps. The instrumentmav be adjusted to any latitude and is probably the most practicaland serviceable equatorial made. The subjoined description
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . scribed below in his own words. The eye end, suitable for heavyspectroscopes, &c., is fitted to the butt end of the telescope bybayonet jomts and tightening screws, so that it can be exchangedfor a micrometric eye end with almost as little trouble as the ex-changing of an eye-piece. The illumination of the circles and themicrometer is by electric incandescent lamps. The instrumentmav be adjusted to any latitude and is probably the most practicaland serviceable equatorial made. The subjoined description of thenew slow motion in declination is taken from Proc. E. Dubl. Soc,1886, p. 107. The Blow motion arrangements usually uaed In equatorials are of either oftwo forma, viz., (a) an endlesa screw working Into a sector or portion of atoothed circle of long radii 8, or (6) a screw applying or pushing directlyagainst an enn, that arm bei. g kept in contact with the screw by a spiral orsome other form of spring having a considerable range of notion. The first (a)possesses the disadvantag
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Keywords: ., bookcentury1900, bookdecade1900, bookidencyclopaedi, bookyear1902
