Paul's  L.M. Ericsson 1880s
Brygga Wheatstone bridge & Resistance Box
click for bigger
My 1880s Ericsson  Brygga 		1889 catalog
Brygga in Ericsson 1889 catalogue p.31

click photograph for larger images
1880s box is constructed of wood with 15mm thick ebonite top.
Pins are 55mm tall brass with ebonite grips.

total dimension: 230mm x 90mm  (9 inch x 3.5 inch)
85mm to top of ebonite = 3.4 inch      140mm to top of pegs = 5.5 inch

click for biggerclick for bigger
pre-1900s LM Ericsson name etched into ebonite top
click for larger photo

click for biggerclick for bigger
brass connections on ebonite top - pre-1890 pins
click for larger photo

click for biggerclick for bigger
1880s model comparison to 1890s model
click for larger photos

lmhilda2.jpg (20286 bytes)
An Ericsson Brygga box in use by Lars M Ericsson and his wife Hilda
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
   

current Ericsson logo and name  used courtesy of Telefonaktiebolaget LM Ericsson
© Copyright 1994-2004 Telefonaktiebolaget LM Ericsson. All rights reserved.
no use of images or design from any page on this site is allowed without written permission of site owner
© Copyright 2002 Sidey Angus Graphics. All rights reserved.