Paul's  L.M. Ericsson 922
1890's Wheatstone bridge & Resistance Box 
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My early Ericsson model 922 		model 422 from 1902
#922 in Ericsson 1902 catalogue p.231
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Model 922 resistance box is of construction using wood base with
18mm thick ebonite top. All connections and top plate are brass.
Pins are 45mm tall brass with wide ebonite grips.

total dimension:  220mm x 125mm = 8.7 inch x 4.9 inch
130mm to top of ebonite = 5.1 inch   or  175mm to top of pegs = 6.9 inch

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C.J. Johansson imprint & photo from 1889 Ericsson factory portrait
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beautiful Ebonite top deck & caps on pins
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Ericsson Collection Pages 
Skrivmaskin Swedish double relay Russian double relay Öller Askledare
#24 Galvinometer Öller Key Lindhölm & Wikström Key LM Ericsson Key
1889 Brygga box Telegraph  Main Page 1899 resistance box
 

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