Hubble Space Telescope observations of 10 two-image gravitational lenses

We report an a program to obtain Hubble Space Telescope (HST) observations of galaxy-mass gravitational lens systems at optical and infrared wavelengt hs. Here we discuss the properties of 10 two-image gravitational lens syste ms (Q0142 - 100 = UM 673, B0218 + 357, SBS 0909 + 532, BRI 0952 - 0115, LBQ S 1009 - 0252, Q1017 - 207 = J03.13, B1030 + 074, HE 1104-1805, Q1208 + 101 1, and PKS 1830 -211). We grouped these 10 systems because they have limite d lens model constraints and often show poor contrast between the images an d the lens galaxy. Of the 10 lens galaxies, seven are probably early-type g alaxies, two are probably late-type galaxies (B0218 + 357 and PKS 1830 - 21 1), and one was not detected (01208 + 1011). We detect the host galaxies of the z(s) = 4.50 lensed quasar in BRI 0952 -0115, the z(s) = 2.32 lensed qu asar in HE 1104 - 1805, and the unlensed z = 1.63 quasar near LBQS 1009 - 0 252. We fit a set of four standard lens models to each lens that had suffic ient constraints to compare isothermal dark matter and constant mass-to-lig ht lens models, and to explore the effects of local tidal shears.