Thomas fr Richard Willats. 



/ 



DRAWING INSTRUMENTS, 



In Fish Skin Cases in Sets, from 5s to 2. 2s. 

 Magazine sets, in Mahogany and Rosewood Cases, from 



1. 10s. to 10. 10s. 



Proportional Compasses, Napier's Compasses, Ivory, Box, and 

 Ebony Rules. T Squares, etc. 



METEOROLOGICAL INSTRUMENTS. 



Upright or Pediment Barometers, Best Wheel Barometers, Marine 

 Barometers, Standard Barometers of the best Construction, Improved 

 Simpisometer, Standard and Plain Thermometers, Day and Night Self- 

 registering Thermometers, in a variety of Mountings. Sixes ditto, 

 Differential Thermometers, Chemical, Botanical, Medical, Brewing, 

 and Bath Thermometers. 



HYDROMETERS, Sec. 



Sykes's, Twaddle's, and Beaume's Hydrometers. 



Glass Hydrometers. 



Lactometers, Saccharometers, Chlorometers, Alkalimeters, 



Chridroraeters, Hygrometers, Pluviometers, Antometers, and 



Urinometers, in great variety. 



Spirit Bubbles, etc. 



