This is from...Encyclopaedia or a Dictionary of Arts, Sciences and Miscellaneous Literature,Philadelphia - MDCCXCVIII
It contains the following engravings on an 8x10 sheet...
Fig. 213. Mechanical paradox, invented by Mr. James Ferguson, used to show the different lengths of days and nights, the vicissitudes of the seasons, the retrograde motion of the nodes of the moon's orbit, the direct motion of the apogeal point of her orbit, and the months in which the sun and moon must be eclipsed. 214. Mural quadrant, fixed to the wall, made of copper and is of about 5 feet radius, 215. The vernier (detail) of the quadrant, 216. Cometarium, 217. Cometarium, rear view, used to show the motion of a comet or eccentric body moving round the sun, describing equal areas in equal times, and may be so contrived as to show such a motion for any degree of eccentricity. It was invented by the late Dr. Desaguliers.
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