606 PHILOSOPHICAL TRANSACTIONS. [anNO 1742. 



tion of the council of the Royal Society, the result of the same is here subjoined 

 as follows : that is, 



1. The Paris half toise, as set off on the standard in the Royal Society, con- 

 tains English inches by the same standard 38.355. Whence it appears, that 

 the English yard and foot, is to the Paris half toise and foot, nearly as 107 to 

 114. For as 107 to 114, so is 36 to 38.35514. 



2. The Paris 2 marc, or 16 ounce weight, weighs English Troy grains 

 7560. Whence it appears, that the English Troy pound, of 12 ounces, or 

 5760 grains, is to the Paris 2 marc or \6 ounce weight, as 16 to 21 : that the 

 Paris ounce weighs English Troy grains 472.5, and that consequently the Eng- 

 lish Troy ounce is to the Paris ounce, as 64 is to 63. 



3. The English Avoirdupois pound weighs Troy grains 7004 ; hence the 

 Avoirdupois ounce, of which 16 make a pound, is found equal to 437.75 Troy 

 grains : and it follows of consequence, that the Troy pound is to the Avoirdu- 

 pois pound, as 88 to 107 nearly; for as 88 to 107, so is 5760 to 7003.636; 

 that the Troy ounce is to the Avoirdupois ounce, as 80 to 73 nearly ; for as 

 80 to 73, so is 480 to 438 ; and lastly, that the Avoirdupois pound and ounce, 

 is to the Paris 2 marc weight and ounce, as 63 to 68 nearly ; for as 63 to 68, 

 so is 7004 to 7559.873. 



4. The Paris foot, expressed in decimals, is equal to'l.o654 of the English 

 foot, or contains 12.785 English inches, 



^ Method of making a Gold-coloured Glazing for Eartheyi Ware ; communicated 

 by M. Godofrid Heinsius, Astron. Prof, at St. Petersburg. N° 463, p. 188. 

 Take of litharge 3 parts ; of sand or calcined flint 1 : pound and mix these 

 very well together, then run them into a yellow glass with a strong fire. Pound 

 this glass, and grind it into a subtile powder, which moisten with a well satu- 

 rated solution of silver ; make it into a paste, which put into a crucible, and 

 cover it with a cover. Give at first a gentle degree of fire ; then increase it, 

 and continue it till you have a glass, which will be green. Pound this glass 

 again, and grind it to a fine powder ; moisten this powder with some beer, so 

 that by means of a hair pencil you may apply it on the vessels, for any piece of 

 earthen ware. The vessels' that are painted or covered over with this glazing, 

 must be first well heated, then put under a muffle, and as soon as the glass 

 runs, you must smoke them, (afflare debes fumum) and take out the vessels. 



Excerpta ex Ephemeridibus Meteor ologicis Romanis Anni 174*j observante Di- 

 daco de Revillas, Abbate Hieronymiano, in Romana Acad. Math. Prof, et 

 R.S.S. N°466, p. 193. 

 This monthly register of the weather at Rome is of no further use now. 



