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We present HST imaging of eight spectroscopically-confirmed giant arcs, pairsand arclets. These objects have all been extensively studied from the groundand we demonstrate the unique advantages of HST imaging in the study of suchfeatures by a critical comparison of our data with the previous observations.In particular we present new estimates of the core radii of two clusters(Cl0024+16, A370) determined from lensed features which are identifiable in ourHST images. Although our HST observations include both pre- andpost-refurbishment images, the depth of the exposures guarantees that themajority of the arcs are detected with diffraction-limited resolution. A numberof the objects in our sample are multiply-imaged and we illustrate the ease ofidentification of such features when working at high resolution. We discuss themorphological and scale information on these distant field galaxies in thelight of HST studies of lower redshift samples. We conclude that the dominantpopulation of star-forming galaxies at z=1 is a factor of 1.5-2 times smallerthan the similar group in the local field. This implies either a considerableevolution in the sizes of star-forming galaxies within the last $\sim$10 Gyrsor a shift in the relative space densities of massive and dwarf star-formingsystems over the same timescale.Comment: 9 pages (no figures), uuencoded, compressed Postscript. Postscript  text, tables and figures (803 Kb) available via anonymous ftp in at  ftp://ociw.edu//pub/irs/pub/hstarcs.tar.

Hubble Space Telescope Observations of Giant Arcs: High-Resolution Imaging of Distant Field Galaxies