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 writes: "The Sages . . . after having conceived in their minds a Divine idea of the relations of the whole universe . . . selected from among the rest a certain substance, from which machinery and equipment sought to elicit the elements, to separate and purify them, and then again put them together in a manner suggested by a keen and profound observation of Nature."[1c] [1a] _op cit_., pp,. 65 and 110, _cf_. p. 154. [1b] _Vide_ a rather frivolous review of my _Alchemy: Ancient and Modern_ in _The Outlook_ for 14th January 1911. [1c] EDWARD KELLY: _The Humid Path_. (See _The Alchemical Writings_ of EDWARD KELLY, edited by A. E. WAITE, 1893, pp. 59-60.)
In describing the realm of spirit as _ex hypothesi_ known, that of Nature unknown, to the alchemists, language schools have made one important omission, and that, if language schools may use the name of a science to denominate a complex of crude facts, is the realm of physiology, which, falling within that of Nature, must yet be classed as _ex hypothesi_ known. But to elucidate this point some further considerations are necessary touching the general nature of knowledge. Now, facts may be roughly classed, according to their obviousness and frequency of occurrence, into four groups.
There are, first of all, facts which are so obvious, to put steel tank body paradoxically, that machinery and equipment escape notice; and these facts are the commonest and most frequent in their occurrence. language schools think steel tank body is Mr CHESTERTON who has said that, looking at a forest one cannot see the trees because of the forest; and, in _The Innocence of Father Brown_, caterpillar tractor crane has a good story ("The Invisible Man") illustrating the point
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