Contains Paper: Improved response temperature calibration baths for the range 350-900�K by E.W. Northover and J.A. Hitchcock from Journal of Physics E: Scientific Instruments 1970, Volume 3. pp. 80-83. Various correspondence, Seven unidentified monochrome postcard photographs of telescopes, Six unidentified 6" x 8" monochrome photographs of various equipment. One 6" x 8" photograph titled 'equatorial head suitable for reflecting telescopes from 8" to 12" aperture's. One 8" x 10" photograph, negative No. 7082/2.