[13] Nothing can be more unsatisfactory than the system of scales used in Mr. Newton’s work. They are in feet and decimals of a foot; a mode of notation very rarely used for any purpose, and never, so far as I know, adopted by any architect in his professional practice. The consequence is that such scales are not to be purchased; and if ordered there is the greatest possible difficulty in getting them made. The inconvenience is aggravated in this case by the slovenly practice of not putting scales to the plates: all the information the engraver condescends to is “Scale 1 ÷ 30,” or “1 ÷ 10,” &c., as the case may be. The consequence is that not one person in a hundred understands to what scale the drawings are made, and not one in a thousand will take the trouble to construct the scales which are indispensably necessary to enable him to study the plates. [14] As a proper punishment for the introduction of so troublesome a novelty as these decimal scales, either the draftsman or lithographer has separated by a dot all the first figures of the decimals in the plate of the restored order (Plate xxii.). A dimension, therefore, which reads 2·96 or two feet eleven inches and a fraction in plate xxi., reads 2 ft. 9·6, or two feet nine inches and a fraction, in plate xxii. The lower diameter, which scales three feet six inches and one-third, reads three feet five inches and one-third, and so on. In fact, nine-tenths of the dimensions are absolutely wrong. The remaining tenth are right by accident; but most of these are so, simply because the lithographer has been too lazy or too inaccurate to put any sign by which they can be read. All this not only increases tenfold the labour of consulting the plates, but renders it doubtful whether frequently it is not a mere fighting with shadows to contest any theory on such documents. [15] In a note in p. 162 it is stated that “the wheel is made somewhat smaller than its true scale, as if drawn in strict elevation it would convey a false impression of the effect of the original group.” On what theory, it is difficult to understand; but there is nothing to intimate that the figures or horses are not to the scale 1 ÷ 10, which is marked on the plate. Either, however, the text or the drawing is wrong; unless both are so, which seems probable.