The Glass Negative Collection comprises several glass plate negatives in which the developed photos appear in many of the City of Portland, Maine, Annual Report of the Commissioner of Public Works between 1892- 1920. They illustrate the work the Public Works Department was undertaking. In the reports, there are many before and after pictures. Only twenty glass plate negatives survive, eighteen measuring 8 x10 inches and two measuring 5 x 7 inches. Not all photographs have been published.