BAIRJD &TATLOCK: (LONDON) LTD. 



4157 



4158-4159 



4160 



4161 



4157 Mason's Hygrometer, ranged 30 to 120 F., for general use or for coal mines. Divided 

 on stem in i. 



A. Japanned case . . . . . . . . . . . . . . each 18 6 



B. Copper case . . . . . . . . . . . . . . 100 



and drv bulb (Mason's hverometer^. onal class scales on oolished oak 



1 15 6 



1 12 

 10 



4158 Thermometer, wet and dry bulb (Mason's hygrometer), opal glass scales on polished oak 



board, standard pattern, with National Physical Laboratory Certificate 



4159 Thermometer, wet and dry bulb as above, without Certificate 



4160 Thermometers, Six's maximum and minimum with 10 in. metal scale, in japanned 



frame, with magnet, best English make . . 



4161 Thermometers, Six's 10 in. with scale of porcelain, in white japanned case with magnet, 



round bulb pattern . . . . . . . . . . . . . . each 12 6 



1 5<] MO ! 50 ' 60'! 70 ' 80 ' 90 "100 'lid 120 '130 '145 



JUy^ya^r 



4162 



4162 Thermometer, maximum and minimum, horizontal pattern on polished boxwood back, 



with hooks for affixing to wall .. .. .. .. ;. .. each 11 



CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



