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1. Being desirous of obtaining an accurate copy of the English Imperial Standard Troy Pound, for an intended comparison of our weights therewith, I applied to the late Captain Kater, and he had the goodness to procure for me not only a copy made by Mr. Bate, exactly similar to those described in his paper, but also a balance of Mr. Robinson, of the same dimension and construction as that used by himself in comparing the legal standard in the custody of the Clerk of the House of Commons. The copy of the Troy pound is of the same kind of brass as that used by Mr. Bate for the other copies sent by Captain Kater to different towns in Great Britain. It bears the stamp “Ty Pd 1824” ; the same stamp, in fact, that was upon the pound No. 2. † which Captain Kater sent to Edinburgh. I shall designate this pound by the letter K. I received it, March 12, 1827, from the late Dr. Young . He had noted upon the cover of the box, "Imperial Troy pound: found by Captain “ Kater to exceed the standard a very little, not more than ·006 grain.” 2. Fearing that this comparison (giving onlyone limit, for it is not said how much the difference isbelow 0·006 gr.) might not be made with that care which I thought necessary for the use I intended to make of the copy, I wrote again to Captain Kater, begging him to send me a second copy compared more carefully with the standard. He kindly undertook the task, ordered for me at Mr. Robinson’s a second copy made of brass, together with divisions by halves, and sent it me in the summer of 1828, with the following notice:

philosophical transactions of the royal society of london

XXII. A comparison of the late imperial standard troy pound weight with a platina copy of the same, and with other standards of authority. communicated by professor Schumacher, For. Memb. R. S., in a letter to F. Baily, Esq., V. P. and Treas. R. S