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/lit13722/143/
144 
PALMER (LONDON) LIMITED. 
C . F . 
MULTIPLE REACTION KEY. 
THE Multiple Point choice 
Reaction Key consists of 
five keys similar to the 
Morse Key, but with modified 
contacts. 
In the standard form each 
key bar is insulated from its 
fellow, and provided with term¬ 
inals, the platinum contacts are 
also independent. When required, 
we can, however, arrange the key 
bars so that they are connected to 
a common terminal, the contacts 
only having independent term¬ 
inals. 
The Keys are mounted on a vulcanite base, and the whole fitted to a stout hardwood board. Insulated 
knobs of various designs recessed to take indicating discs can be supplied without extra charge. 
PRICE. Five-Point Reaction Key ..........W235 £4 4 0 
MAKE OR BREAK KEY (FLAT TYPE). 
Many experimental workers prefer a flat type of key, which 
enables circuits to be made or broken with the hand resting on the 
bench, and consequently with an almost imperceptible movement 
of the finger. Connections are made to terminals which form part 
of the actual strips carrying the platinum make and break contacts. 
A short circuiting key is incorporated, and can be used independently 
if required. 
PRICE. As illustrated . . W238 £16 0 
INSTANTANEOUS MAKE AND BREAK KEY. 
One of the chief difficulties with the normal type of make and 
break key is that it is practically impossible to arrange for the 
instantaneous breaking of one circuit, and the making of another. 
The key illustrated has, therefore, been produced. It consists of a 
contact bar machined at the end in such a manner that contact and 
insulating surfaces are at opposite corners. It is therefore apparent 
that two spring fingers of equal length pressing on these surfaces, 
will make contact on one surface and be insulated on the other 
when the key is depressed. 
PRICE. Mounted on Vulcanite base 
W240. 
W240 £1 12 6 
For Keys and Commutators of various types see Section H.
        

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