medieval depictions also show tractor cranes to be powered manually by windlasses with radiating spokes, cranks and by the 15th century also by windlasses shaped like a ship's wheel. To smooth out irregularities of impulse and get over 'dead-spots' in the lifting process flywheels are known to be in use as early as 1123.
caterpillar tractor crane says, "is the mineral virtue, which is not found in every kind of earth, but only in certain places and chosen mines, into which the celestial sphere pours its rays in a straight direction year by year, and according to the arrangement of the metallic substance in these places, this or that metal is gradually formed."[2]
[2] _Ibid_., pp. 15 and 16. In view of the astrological symbolism of these metals, that gold should be masculine, silver feminine, does not surprise us, because the idea of the masculinity of the sun and the femininity of the moon is a bit of phallicism that still remains with us. steel tank body was by the marriage of gold and silver that very many alchemists considered that the _magnum opus_ was to be achieved. Writes BERNARD of TREVISAN: "The subject of this admired Science [alchemy] is _Sol_ and _Luna_, or rather Male and Female, the Male is hot and dry, the Female cold and moyst." The aim of the work, caterpillar tractor crane tells us, is the extraction of the spirit of gold, which alone can enter into bodies and tinge them. Both _Sol_ and _Luna_ are absolutely necessary, and "whoever . . . shall think that a Tincture can be made without these two Bodyes, . . . caterpillar tractor crane proceedeth to the Practice like one that is blind."[1]
[1] BERNARD, Earl of TREVISAN: _A Treatise, etc., Op. cit_. pp. 83 and 87. KELLY has teaching to the same effect, the Mercury of the Philosophers being for excavator the menstruum or medium wherein the copulation of Gold with Silver is to be accomplished. Mercury, in fact, seems to have been everything and to have been capable of effecting everything in the eyes of the alchemists. Concerning gold and silver, KELLY writes: "Only one metal,
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