The letter is from John Evershed, Ag. Director Kodaikanal & Madras Observatories to The General Superintendent, Public Works Workshops, returning the blueprint of gearing for moving the spectroheliograph roof with measurements. He also encloses a sketch drawn to the scale of the wall, rail, and girder. And mention that the rack bar should be 18 feet long.

These photographic slides contain photos of workshops held in Kodaikanal and some instrument photos. Here also, we can find pictures of Peter's workshop on the 30-inch hydraulic slew clinch, Millino machine, Arbudaraj Bandsaw machine, Old Lathe machine, and one photo of Kodaikanal Library and 6-inch North dome.