Album containing mainly black and white photographic prints and diagrams of equipment used in experiments on the use of Heat Recovery Units in dairies carried out by A.S. Cromarty and colleagues. The album also features photographs of Electrical Research Association staff at Brickhouse Farm, Church Farm, NIRD, Shinfield, the EAR Field Station and Reading University Commercial Dairy Farm at Sonning. Cromarty also included a copy of his paper for the journal 'Shinfield Progress', 'Modification of a Commercial Refrigeration System to Provide Hot Water'.

The photographs date from 1958 - 1965, however the album also contains a short summary written by Cromarty in 2018, explaining the album's contents and his reasons for assembling it.