I. GEOMETRICAL DRAWING. 13 



54b. Pantograph, large model, with double scale and reverse 

 action, belonging to the Indian service. Four of these large in- 

 struments are now in use. M. Adrian Gavard, Paris. 



54c. Frame, containing the figures of pantographs and panto- 

 polygraphs drawn with the above instrument. 



55. A Large Collection of Mathematical Instruments 

 for Geometrical and Fortification Drawing, as well as for 

 Artillery purposes. Property of His Highness the Prince 

 Pless, Fiirstenstein. Committee of Breslau. 



This ancient collection, dating from the commencement of the last century, 

 is remarkable for the excellent workmanship and good state of preservation 

 of the instruments. 



It contains 19 compasses and 11 accessory parts, 28 rules and scales, two of 

 the same with two keys for fortification drawing, eight triangles and set 

 squares, 10 protractors, two pantographs, and 52 other instruments. In all, 

 134 pieces. 



56. Case of Mathematical Instruments. 



Renaud Tachet, Paris. 



57. Proportional Compasses. Renaud Tachet, Paris. 



58. T-squares, Set Squares, and Curves. 



Renaud Tachet, Paris. 



59. Diagonal Scale. 



Geneva Association for Constructing Scientific Instru- 

 ments. 



GO. Scales made of Mica, for use in geometrical drawing 

 (see Nos. 275, 879, 2591, 3468, &c.). 



Max. Raphael, Breslau. 



61. Perspective Apparatus invented by James Watt. 



Bennet Woodcraft, F.R.S. 



62. Complete Set of Mathematical Instruments, with 

 all the modern improvements ; as used by professional draughts- 

 men, &c. ; illustrated by diagrams of work performed. 



Wm. Ford Stanley. 



62a. Magazine Case of Drawing Instruments. 



Henry Porter. 



64. A Case of Mathematical Instruments, probably 

 Dutch, made at the beginning of the 18th century. 



Lewis Evans v 



65, Two Cases of Drawing Instruments. Mark Eames. 



