690 SEC. 14. METEOROLOGY. 



Six's Self-registering Maximum and Minimum Ther- 

 mometer. S. G. Denton. 



Six's Self-registering Thermometer, maximum and 

 minimum. Dring and Fage. 



Terrestrial Radiation Thermometer, on brass stand. 



Pas tore Hi. 



Portable Maximum and Minimum Thermometers, 



mounted on their own case. Pastorelli. 



Portable Maximum and Minimum Thermometers, on 



metal scales. Pastorelli. 



2826o. Hicks's Patent Thermometer Shield. 



J. J. Hicks. 



This is an arrangement for effectually protecting the figures and divisions of 

 thermometers and other scales from the corrosive action of air and moisture, 

 and consists of an outer glass tube hermetically sealed on to the thermometer 

 stem whereby the scale is rendered absolutely indestructible. It his here 

 exhibited, applied to maximum, minimum, and other thermometers. 



2826p. Delicate Thermometers, with gridiron and spirally 

 formed bulbs. J. J. Hicks. 



By the diffusion of the mercury in the bulb over a large surface, and 

 selecting tubes of small and uniform bore, very great sensibility is attained. 



2826q. Six's Thermometer with Patent Cylinder 

 Jacket Bulb. J. J. Hicks. 



In this instrument by diffusing the spirit over an extended area, a degree 

 of sensibility is attained equal to mercury. 



2826y. Mercurial Standard Thermometer, by Trough- 

 ton and Simms. Royal Society. 



2826z. Spirit Thermometer, for very low temperatures, 

 by Newman. Royal Society. 



Hicks's Patent Terrestrial Radiation Thermometer. 



J. J. Hicks. 



The difficulty arising from the condensation of moisture in the outer 

 cylinder of ordinary terrestrial minimum thermometers, is, in this instrument, 

 entirely obviated by simple but efficient means. 



Highly sensitive Thermometers, with open scales in sets 

 of E.IX, one scale being continuous with the other, and so open as 

 to admit of readings being taken to one-tenth of a degree. 



J. J. Hicks. 



Hicks's Patent Solar Radiation Thermometer with 

 electrical test. J. J- Hicks. 



In constructing this improved radiation thermometer, special precautions 

 are adopted to ensure perfection of vacuum, and the enclosing tube is fur- 

 nished with platinum wire terminals to admit of the vacuum being tested by 



