CATALOGUE. — PHfiOSOPHV AND ARTS, PRACtlCAL MKCHAKICS. 15.* 



Stockholm, foot (.974 CelsiusPh.lr.) 



Strasburg, town foot .956 H. 



Strasbuig, country foot .969 H. 



ToletIo= Madrid H. 



Trent, foot 1.201 H. 



Trieste, ell for woollens 2.220 H. 



Trieste, ell for silk 2.107 H. 



Turin, foot I.C76 H. 



1.681 C. 



Turin, ras 1-958 C. 



Turin, trabuco 10.085 C. 



Tyrol, foot I.O96 V. 



Tyrol, ell 2.639 V. 



Valladolid, foot .9O8 H. 



Venice, foot 1.137 H. 



1.140 Bernard, 



Howard, V. 

 I.1G7 C. 

 Venice, braccio of silk 2.108 C. 

 Venice, ell 2.089 V, 



Venice, braccio of cloth 2.250 C. 

 Verona, foot 1.117 H. 



Vicenza, foot 1.136 H. 



Vienna, foot 1 .036 H. 



1.037 Howard,C.V. 

 Vienna, ell 2.557 V. 



Vienna, post mile 24688. V. 

 Vienne in Dauphinc, foot 1.058 H. 

 Ulm, foot .826 H. 



Urbino, foot I.162 H. 



Utrecht, foot .741 H. 



Warsaw, foot I.I69 H. 



Weseln Dordrecht H. 



Zurich, foot .979 H. 



.984. Ph. M. VIII. 

 289. 



Modern Measures of surface and capacity. 



In Austria, a yoke of land contain! isoo square fathoms; 

 1 laetz or bushel 1.9471 cubic feet, 1 eimerz:*o kannen:: 

 1.79a cubic feet, of Vienna; 1 fassmo eimer. Vega. 



In Sweden, a kanne contains io( cubic inches Swedish. C. 



Measuring Instruments. 

 For their expansion see Heat. 

 Ph. tr. 1790. 121. 



Rods. 



Lemonnier on the increase of length of two 



rods. A. P. 1761. H. 26. 

 Boulard's invariable toise. Roz. XL. 198. 



Roy found that deal rods, not varnished, were lengthened 

 about half an inch in 300 feet by exposure for one night to 

 moisture. Glass tubes were substituted for them, with 

 caps of bell metal at the ends, connected with them by 

 springs, which were brought in each operation to a certain 

 mark on the rods ; in order that unequal compression of 

 the rods might be avoided. The French have employed 

 rods of metal not brought perfectly into contact, measuring 

 the short distance by a micrometer. 



Chains. 

 Ramsden's steel chain. Ph. tr. 1785. .394. 



The chain was found in the course of the trigonometrical 

 survey began by General Roy not only the most convenient 

 but also the most accurate measure. It was extended, 

 when used, by a considerable weight, which was always 

 equal . See Figure of the earth . 



A chain of 40 links each 2^ feet long. Ph. 

 tr. 1795. 423. 



Scales. 



Hooke on diagonal divisions. Animadv. on 

 Hevelius. 



Wallis on diagonal divisions. Ph. Ir. 1674. 

 IX. 243. 



Calibers, Leup. Th. Suppl. t. 24. Robertson 

 on instruments. 



Ramsden's description of a machine for di- 

 viding straight lines. 4, R. S. 



Beam compasses. See compasses. 



Enc. Br. Art. Calibers. 



Micrometers. 

 See Measurement of Angles-. 



