Goldberg patented improved methods for electroplating zinc on iron in 1902 and published numerous technical papers on improved printing techniques, reducing moiré effects in half-tone printing, photoengraving and other topics. In 1910 he became well known for an improved method for making neutral gelatin wedges (" Goldberg wedge ") that was widely used in sensitometry and the Densograph [ de ], an instrument that greatly reduced the labor required to measure the characteristic curves of photographic emulsions.