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For otherwise, if the mind be limited, there must be a definite limit to its comprehensive faculty, and it is easy to conceive that such a limit would soon become apparent to every student; as apparent as it is that a being, confined within three dimensions of space, cannot, without altering his nature, escape from these three dimensions, nor from the laws which govern matter having length, breadth and thickness alone, without the external fourth dimension, with its interchangeability of exterior and interior angles.
The instruction-book prepared for the use of inspectors stated that 'The parts should not be tinkered nor bent, as they are accurately made and interchangeable. The difficulties encountered in fitting them properly doubtless gave rise to a story that Mr. Edison had stated that there were three degrees of interchangeability.
In actual practice, the conditions are almost always complicated, either by necessities of mounting in particular places, such as turrets and casemates; or by the advantages attending the interchangeability of stores, or other circumstances; and it requires great watchfulness to keep abreast of the ever-growing improvements of the day.
These are much affected by such items as simplicity of design, strength against wear and tear, ease of assembly and interchangeability of parts, easily removable engines, increase in durability by the use of metal construction for parts of the machine and the propeller, the elimination of rubber joints, substitution of air for water cooling, facilities for loading and unloading in a commercial machine, simple and efficient navigational instruments and self-starter.
Now that they are known to be convertible into one another without loss, they are spoken of as all of them results of one and the same force, manifesting itself in different modes. This mutual interchangeability of the forces of nature, according to fixed numerical equivalents, is the part of the new doctrine which rests on irrefragable fact.
Prior to that time all firearms of public or private manufacture, in England, had been made by hand, the interchangeability of all the parts of any given number of guns being an end accomplished in this country alone.
It is significant of Edison's work, now dimmed and overlaid by later advances, that at the very outset he recognized the vital importance of interchangeability in the construction of this delicate and sensitive apparatus. But the difficulties of these early days were almost insurmountable. Mr.
Charles Mercier puts the interchangeability of sexual and religious feelings in the following passage: "Religious observances provide an alternative, into which the amatory instinct can be easily and naturally diverted.
To draw so straight a line of demarcation as to limit the one entirely to tissue or cell production, and the other to heat and force production through ordinary combustion, and to deny any power of interchangeability under special demands or amid defective supply of one variety, is, indeed, untenable.
Though it is probable that this idea of standardization, or interchangeability, originated independently in Whitney's mind, and though it is certain that he and one of his neighbors, who will be mentioned presently, were the first manufacturers in the world to carry it out successfully in practice, yet it must be noted that the idea was not entirely new.
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