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6
The invention of this construction arose from the consideration, that as the Saccharometer could not be accurate without a distinct Scale, or set of Divisions, for each range of Specific Gravity, and that this would be perfectly accomplished if the Instrument were furnished with a a change of Stems, each bearing a Scale shorter than the preceding; so would the same perfection be attained by transferring the same Stem to different Instruments, each larger than the preceding in the same proportion.
It then followed that, to preserve the same length of Scale in the same Instrument, that part of it below the Stem should be successively augmented at each new range of Specific Gravity by such a bulk as would duly increase its original proportion to the same set of Divisions; upon investigating this principle, it most satisfactorily appeared that all errors which had hitherto so much embarrassed the construction of the Saccharometer, would be annihilated at once by the simple augmentation of the part immersed by a bulk EQUAL TO THE WHOLE BULK OF THE DIVIDED SCALE, at every repetition of the scale.
A very slight further consideration led to the conclusion that, as an addition to the weight of the Instrument is also required at the commencement of each new range of Specific Gravity, these augmentation of bulk and weight should be combined, so that both may be applied at once; and it readily occurred that a change of the balancing Poise at the lower Stem would best effect this: a simple mode of attaching these Poises was not so obvious, and repeated attempts were made by the inventor to accomplish it in such a manner as should be free from every objection; this, however, might not have been effected, but for the kind suggestion of a distinguished scientific person, eminent for the perfection of his productions, to whom the inventor is indebted for the truly unobjectionable method which he now employs.
It will be obvious that the additional Poises each require such precise adjustment to the first bulk and weight of the Saccharometer as not only to render it a new Instrument at each change of Poise, but likewise so exactly in accordance with the first as to admit of the same set of Divisions indicating the Specific Gravity of the Wort throughout the range of each Poise with perfect accuracy: and that whilst this Instrument answers every purpose of five complete Saccharometers, each successively taking up the range of Specific Gravity at the point where the range preceding ends, it nevertheless performs all this without the least embarrassment or confusion,