I. SPECIAL COLLECTIONS. 47 



199. Model of a Petroleum Testing Apparatus, for ascer- 

 taining the temperature at which its inflammable vapour ignites. 

 Designed by T. W. Keates, Ksq., and proposed as a standard for use 

 in accordance with authoritative uniform regulations. Constructed 

 by How & Co. 



200. Brass Scale of 41 inches, divided into tenths, and of a 

 metre divided into millimetres ; both scales at 62 Fahr. Con- 

 structed by Dollond, tind now the property of Mr. Petrie. 



This possesses some scientific interest, having been compared several times 

 with Shuckburgh's scale by Capt. Kater. He found in 1830, and again in 

 1831, that 36 inches of the scale = 35' 99893 inches of the imperial 

 standard yard, afterwards destroyed in 1834; and assuming the scale of 

 inches to be perfectly correct, that the metre = 39 '37045 inches. 



Compared at the Standards Office in February 187 6, with the bronze official 

 yard, which has a standard metre at C. marked on the same bar. From the 

 mean of six comparisons, 36 inches of the scale = 35 '99961 inches of the 

 new imperial standard yard, and the metre = 0*999684 metre, being 0'316 

 millimetre less than the Metre, dcs Archives at the normal temperature 

 of C. 



223b. Fraudulent Balance, seized from a butcher's shop 

 by an inspector of weights and measures. 



Standards Department, Board of Trade. 



An illustration of the principle of the balance. One of the suspending 

 hooks of an ordinary equal-armed balance is bent outwards thus lengthening 

 that arm of the beam, and enabling the butcher to make about 14 oz. of meat 

 counterbalance a 1 Ib. weight on the other end of the beam. 



SET OF OLD STANDARD MEASURES LENT BY THE MAYOR AND 

 CORPORATION OF THE CITY OF WINCHESTER. 



201. Very old Steelyard Weight, date unknown. Found 

 at Hyde Abbey, Winchester. 



202. Set of Standard Troy Weights, from 256 oz. to 

 1 oz., of Queen Elizabeth. Dated 1588, being the year in which 

 she granted a charter to the city. 



203. Set of Standard Weights (avoirdupois), 56 Ibs., 7 Ibs., 

 8 Ibs., 2 Ibs., 1 Ib., of Queen Elizabeth, dated 1588, being the year 

 in which she granted a charter to the city. From the Muniment 

 Room, Winchester. 



204. Standard Weights (56 Ibs., 28 Ibs., 14 Ibs., and 7 Ibs.). 

 Supposed to be of the date of Edward III. From the Muniment 

 Room, Winchester. 



205. Standard Yard Measure. Henry VII. From the 

 Muniment Room, Winchester. 



206. Standard Quart and Pint of William III. Dated 

 1700. From the Muniment Room, Winchester. 



