THREE:On examining the apologue of Prodicus, we find it characterised by a somewhat similar style of reasoning. There is, it is true, no reference to physical phenomena, but Virtue dwells strongly on the truth that nothing can be had for nothing, and that pleasure must either be purchased by toil or atoned for by languor, satiety, and premature decay.81 We know also that the Cynical school, as represented by Antisthens, rejected all pleasure on the ground that it was always paid for by an equal amount of pain; and Heracls, the Prodicean type of a youth who follows virtue in preference to vice disguised as happiness, was also the favourite hero of the Cynics. Again, Plato alludes, in the Philbus, to certain thinkers, reputed to be great on the subject of physics, who deny the very existence of pleasure. Critics have been at a loss to identify these persons, and rather reluctantly put up with the explanation that Antisthens and his school are referred to. Antisthens was a friend of Prodicus, and may at one time have shared in his scientific studies, thus giving occasion to the association touched on by Plato. But is it not equally possible that Prodicus left behind disciples who, like him, combined moral with physical teaching; and, going a little further, may we not conjecture that their opposition to Hedonism was inherited from the master himself, who, like the Stoics afterwards, may have based it on an application of physical reasoning to ethics?Arrangement comes next; in this the first matter to be considered is convenience of manipulation. The cutting position should be so arranged as to admit of an easy inspection of the work. An operator having to keep his hand on the adjusting or feed mechanism, which is about twelve inches above the work, it follows that if the cutting level is four feet from the floor, and the feed handle five feet from the floor, the arrangement will be convenient for a standing position. As the work requires continual inspection and hand adjustments, it will for this reason be a proper arrangement to overhang both the supports for the rack and the cutting tools, placing them, as we may say, outside the machine, to secure convenience of access and to allow of inspection. [156] The position of the cutting bar, crank, connections, gearing, pulleys, and shafts, will assume their respective places from obvious conditions, mainly from the position of the operator and the work.