392. Gold Assay Balance 



The gold-alloy scales have a bearing capacity of 5 ^grammes, and are 

 provided with axes of agate and pans, and indicate, when fully weighted, 

 ^ milligr. 



B. STEELYARDS. 



332. Roman Steelyard or S tat era, of bronze. It was 

 found in the year 1855, during building operations at Watermoor, 

 a suburb of Cirencester, Gloucestershire. 



Professor A. H. Church. 



The beam, which is nearly 17 inches long, may be reversed, and it is con- 

 sequently divided along both its upper and under edges. When the fulcrum 

 nearer the head of the beam is employed objects can be weighed more than 

 twice as heavy as those which can be accommodated when the beam is sus- 

 pended by the other hook. To the head of the beam is attached a chain, 

 branching below into two parts, each terminated in bold hooks adapted for 

 grasping soft and bulky articles. This steelyard is a very good example of 

 its kind. The locality which furnished it was the site of the Roman city of 

 Corinium or Durocornovium, which has yielded an immense number of Roman 

 remains, many of which are preserved in the local museum. 



378. Balance for Weighing in Vacuo, on von Jolly's 

 principle. University of Munich. 



383. Model of a Roman Balance, with sliding weight of 

 75 grammes, and stand. 



Physical Institute of the University of Halle (Professor 

 Knoblauch, Director). 



C. WEIGHTS. 



346. Six Standard Weights derived from the axial standard 

 of length. Prof. Hennessy, F.R.S. 



One of these weights is equivalent at 15 centigrade to a cube of distilled 

 water whose side is the one hundred millionth part of the earth's polar 

 axis. The others are submultiples of this weight, and the system is 

 suggested in connexion with the axial standard proposed by Professor 

 Hennessy. 



360. Physical Weights. Hugo Schickert, Dresden* 



361. Eight Sets of Weights, for analytical purposes, 



G. Westphal, Celle. 



The first of these weighs from 1 kilogramme downwards, the second from 

 500 grammes downwards, the third from 100 grammes, the fourth, fifth, and 

 sixth from 50 grammes, the seventh from 10 grammes, and the eighth from 

 0'5 grammes downwards. 



362. Standard Weights, adjusted and gilt. 



G. Westpkal, Cellc. 



