BAIRD &.TATLOCK (LONDON) LTD. 



Al931 s Barometer, Standard, Fortin's principle, tube .3 in. bore, scale divided in & in. 

 and millimetres, with double vernier, thermometer divided into C. and F. degrees, on oak 

 board in glazed teak case, screwed together (as Figs. 1929-1930) 



Special pattern designed for Export. 





8 5 



1931 



I 



1932 



1933 



1931 s Barometer, Mountain, Fortin's principle, with portable tripod stand and gimbals, tube 

 T ^j in. bore, scale graduated in inches and millimetres, with double vernier, in leather 

 sling case .. .. .. .. .. .. .. .. .. 10 10 



1932 s Standard Barometer, improved by Professor Collie, with mechanical device for tem- 

 perature corrections by Dr. Shields, on polished mahogany board, with mirror back on 

 which scale is graduated in millimetres . . . . . . . . . . ..44 



(See Philosophical Magazine for May, 1896, pp. 406-413.) 



1933 s Student's Pattern Standard Barometer, Fortin's principle, bore of tube .25 in., with 

 double scales divided into ^ inches and millimetres, on polished board, double vernier 

 reading to .01 in. and .1 millimetre, and thermometer graduated in C. and F. degrees . . 312 



Al933 s Student's Pattern Barometer, as No. 1933, in polished mahogany case, with lock and 



key .. .. .. .. . . .. .. .. .. 4 17 



-CROSS STREET HATTCW GARDEN, E-C 



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