BAIRD &TATLOCK (LONDON) LTD. 



1916 Balloons, collodion. 



1917 Balloons, best soft indiarubber. 



4 

 lOd. 



6 

 I/- 



2 



2d. 

 1/10 



8 II 14 in. length when flat. 



1/6 2f- 3/- each. 



3 



4d. 

 3/6 



6d. each. 

 5/- perdoz. 



"" 

 "J 



1918 



1919 



1920 



1921 



1922 



1918 s 

 1919' 



1920 s 

 1921 s 



1922 s 



Barometer, Bunsen's, syphon tube, graduated into millimetres, filled with mercury, and 

 mounted on mahogany stand, with mirror back to avoid parallax when reading . . 1 



Barometer, Bunsen's syphon, with plain tube and sliding millimetre scale on polished 

 mahogany board for direct reading, suitable for school use . . . . . . 1 



Barometer, designed by Mr. Gee, with boxwood millimetre scale and two sliding points . . 



Syphon Barometer, consisting of an ungraduated Bunsen syphon tube, filled with mercury 

 and mounted on a polished mahogany board fitted with a sliding millimetre scale for 

 direct reading. The necessary adjustments and readings are made on the scale by means 

 of two sliding indexes fitted with cross wires, and mirror backings at the upper and lower 

 surfaces of the mercury column. This barometer is of thoroughly reliable construction, 

 and as the height of the column can be read with fair accuracy to .1 mm., it is suitable 

 for all ordinary purposes. The tube used in the instrument is provided with an air-trap, 

 and fitted with boxwood scale . . . . . . . . . . . . ..112 



Barometer, with ivory scale, sliding vernier, thermometer, and adjusting screw on polished 

 oak frame ...... . . 1 1 





CROSS STREET HATTOW GARDEN, E-C 



386 



