45, CORNHILL, E.G., AND 122, KEGENT STREET, W., LONDON. 163 



o fl ',,,,,',, ,' ,' , ' ' ,.', .',,.',,,, ,',,' , i 



' 1 '"' ' ' J ----- L ^-' 1 '' ' "-^- l '". i '"'''"" 1 " 1 "" Tiirnuiriiiii 7 ^^^^ 



Jik to o ID 70 so 40 so 60 70 eo 30 loo "no" iio iso 



PATENT 



FIG. 317. 



Each. Each. 



s. d. s. d. 



316 Negretti and Zambia's Patent Maximum 



Thermometer,* on Boxwood Scale .... 10 6 



Ditto ditto, Patent Solid Porcelain Scale . 10 fi 



Ditto ditto, Patent Porcelain, or Zinc Scale in 



Japanned Metal Case 10 6 



317 Ditto, ditto, on Negretti and Zambra's Metal Scales 



with Oak mounting, (fig. 317) 12 6 



SELF-REGISTERING THERMOMETERS FOR COLD. 



o 10 20 30 ^0 50 60 70 30 J?0 100 110 /20 



^16^ ^g^ 



LONL'ON ^ e PATENT 



FIG. 322. 



318 Minimum Thermometer, Rutherford's, on Boxwood or 



Metal Scale 3s. 6d. 5 6 076 



319 Ditto, ditto, superior mountings 10 6 



320 Ditto, on Negretti and Zambra's Patent Solid Porcelain 



Scale 10 (y 



321 Minimum Thermometer, mounted on Negretti and 



Zambra's Patent Porcelain or Zinc Scale in 



a Japanned metal Case ....... 10 6 



322 Ditto ditto, on Metal Scales with Oak mounting 



(fig. 322) 12 6 



323 Negretti and Zambra's Vertical Minimum Thermometer, 



a most convenient Window instrument for exhibiting 



Present and Lowest temperature 12 6 15 



* This Instrument is the only Maximum Thermometer that can be recommended, as unless it he broken 

 it cannot be put out of adjustment ; all others are liable to become defective in transit. It is fully described 

 under the head of Standard Maxima Thermometers, pages 36 and 38, and at page 45 will be found 

 particulars of the construction and use of Minima Thermometers. 



11 2 



