Bauhaus-Universität Weimar

Titel:
Palmer Research and Students' Apparatus for Physiology, Pharmacology, Psychology, Bacteriology, Phonetics, Botany, etc.: Manufactured by C. F. Palmer (London) Ltd., Myographic Works, 63a, Effra Road, Brixton, London, S.W. 2. England
Person:
Palmer, C. F.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit13722/90/
PALMER (LONDON) LIMITED. 
91 
C . 
F . 
The perfusion pump consists of any ordinary hypodermic syringe, specially mounted, to be worked 
mechanically from the laboratory shafting. The main feature of the pump is a variable stroke, which can 
be very easily adjusted while it is working, and the fact that the piston on all strokes comes to the bottom 
(outlet) end of the barrel, and therefore the internal capacity remains constant. 
In Fig. 3, A is the driving pulley, having four V grooves for round band, if is a disc crank which 
moves the arm CD through a fixed arc on a pivot at C. On CD is a radial graduated slot having its centre 
at the joint E, when the arm is at its lowest position. Along this slot, and moved by a screw having a 
milled head, shown near C, is a block which gives motion to the piston rod. Now, it is obvious that when 
the arm CD is at its lowest position, the block can be moved along the slot without moving the piston of 
the pump ; it follows that the further from the end C the block is moved, the greater is the movement 
imparted to the piston on the upward stroke of CD. 
The thrust of the pump can be read on the arc, and if the internal diameter of the syringe is known, 
the amount of fluid withdrawn from the receiving chamber C can be computed. In practice, it is con¬ 
venient to place a U-tube containing mercury between the pump and valves to prevent escape of fluid to 
the pump. The ingenuity of the pump is due to the maker.” 
£ 
s. 
d. 
PRICE of Pump as described . . 
FI 
10 
10 
0 
,, Suitable Metal Syringe, for use with the above 
F2 
17 
6 
,, Copper Hot Chamber or Oven, complete with heavy 
felt 
cover 
F3 
21 
0 
0 
,, Glass Valves .. 
. . per 
pair 
F4 
0 
0
        

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