We have built and tested a very large Multigap Resistive Plate Chamber (MRP
C). We discuss the suitability of the multigap RPC for the construction of
large area modules. We give details of the construction technique and resul
ts from a scan across the surface of the chamber. We also report on the imp
lementation of 'half-strip resolution', where we improve the spatial resolu
tion by a factor 2 without increasing the number of read-out channels. (C)
1999 Elsevier Science B.V. All rights reserved.