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 rather in those whose backs are stubborn and stiff bound, to write in folio rather then in smaller folds, in single paper rather then in much doubled and boysterous, with all which particulars this Art will sufficiently consist to practisers nor monstrously unhandy.

Lastly, other ingenious men may, and certainly will soon mend any thing that shall be found amisse, as to any mans particular use, for mine own part I shall never be wanting thereunto, and could at present alter the instrument in severall particulars, did I not fear that in making them more fit for one mans use, they would be lesse fit for anothers; But if any man shall considerately better the businesse, I shall be willing to gratifie him proportionably, to what I my selfe shall gain by it, and that by such a reasonable way as I shall hereafter more particularly propound.

We come to explain our selves in some other Circumstances, first, concerning the manner of discovering the Art, when the time shall come; which shall be this: viz. I will some space before hand appoint a convenient place where all contributers shall receive a printed paper, at large describing both by words and figures, the fabrike, use and application of all and each part of the Instrument, and such as have paid for Instruments shall there receive them, and there will I also give a weeks constant attendance to resolve all difficulties arising to the lesse nimble apprehensions in the practice of the Art.

Now, as for security, that it shall be so discovered according to promise, I have taken care, That (in case of sudden death, or any like accident which may befall me) all impediments thereof may be removed, by depositing in the hands of trusty and able freinds an Instrument exactly fitted, with a punctuall and clear description of the uses and applications thereof. Or if any very scrupulous person shall happen to dream of any ground of suspition, why I should of purpose not discover