BAIRD &.TATLOCKL (LONDON) LTD. 



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A4710 



A4710 3 Pettersen's & Palmquist's Apparatus, improved by Professor R. P. Anderson, Cornell 



University, Ithaca, U.S.A., in portable case . . . . . . . . 5 10 



The advantages over the original apparatus are : 



A. Greater ease of manipulation. 



B. More portable. 



C. Provided with a coil of copper tubing submerged in water to quickly bring the sample to the temperature require 



DESCRIPTION OF THE APPARATUS. 



In the sketch, B represents the burette ; P, the pipette ; C, the compensation tube ; M, the manometer ; Z, Z', Z*, t 

 coil of copper tubing ; and L, the level bulb. The upper extremity of the burette connects with the pipette through stopco 

 1 ; with the manometer through stopcock 2 ; and with the atmosphere, either directly or through the copper coil, throu 

 three-way stopcock Z. The compensation tube connects with the manometer through stopcock 4. This stopcock is made 

 the form shown in the sketch so that the compensation tube may be connected with the atmosphere whenever necessary. Stc 

 cock 5 serves as an inlet for the manometer liquid. The lower extremity of the burette is connected by a piece of rubber tubir 

 which passes under compression screw S to stopcock 6, which in turn connects with level bulb L by means of a suitable leng 

 of patent rubber tubing. 



The burette, pipette, compensation tube, and copper coil are immersed in water contained in a glass cell, and are support 

 by a board that slides in grooves in the sides of the wooden box which encases the apparatus. The glass cell is of rectangu 

 cross-section and is provided with an opening in the bottom in which is placed a two-hole rubber stopper carrying the low 

 end of the burette and a bent glass tube through which the water may be removed. This cell is held in place by a wooden suppc 

 shaped to fit its base, and provided with an opening through which the neck of the cell extends. The board carrying the buret 

 pipette, etc., can be lifted out of the case when the rubber tube is disconnected from the lower end of the burette and the rubl 

 stopper is loosened from the neck of the glass cell. This allows easy access to all parts of the apparatus for cleaning and repaini 

 Further, the position of this board can be adjusted within certain limits by moving the bolts upon which it rests, up or do 1 

 in slots at the base of the grooves. This makes it a simple matter to adapt new glass parts to an old water jacket and case. 



The burette has a capacity of about 25 cubic centimetres, and is calibrated in .0025 cubic centimetres, or in parts per io,o< 

 A large saving in height over the old Pettersson-Palmquist Apparatus is effected by giving the lower end of the burette the fo: 

 shown in the figure. The calibrated portion is brought forward near the front face of the cell to afford greater ease and clearrn 

 in reading. 



The case is provided with a removable front and top to render all parts of the apparatus easily accessible during the manij 

 lation, and with a glass window in the back to give proper illumination when the operator desires to face the window of the roi 

 in which he is working. 



CROSS STREET HATTCTNT GARDEN, E-C 



852 



