  Single grain, (RE)BCO bulk superconductors in large or complicated geometries
are required for a variety of potential applications, such as motors and
generators and magnetic shielding devices. As a result, top, multi-seeded, melt
growth (TMSMG) has been investigated over the past two years in an attempt to
enlarge the size of (RE)BCO single grains specifically for such applications.
Of these multi-seeding techniques, so-called bridge seeding provides the best
alignment of two seeds in a single grain growth process. Here we report, for
the first time, the successful growth of YBCO using a special, 45{\deg} -
45{\deg}, arrangement of bridge-seeds. The superconducting properties,
including trapped field, of the multi-seeded YBCO grains have been measured for
different bridge lengths of the 45{\deg}- 45{\deg} bridge-seeds. The boundaries
at the impinging growth front and the growth features of the top, multi-seeded
surface and cross-section of the multi-seeded, samples have been analysed using
optical microscopy. The results suggest that an impurity-free boundary between
the two seeds of each leg of the bridge-seed can form when 45{\deg}- 45{\deg}
bridge-seeds are used to enlarge the size of YBCO grains.
