In addition, Gilbreth was instrumental in the development of the modern kitchen, creating the "work triangle" and linear-kitchen layouts that are often used today. In the late 1920s, she collaborated with Mary E. Dillon, President of Brooklyn Borough Gas Company on the creation of an efficient kitchen, equipped with gas powered appliances and named the "Kitchen Practical". Inspired by Dillon's criticisms of her own kitchen, it was designed on three principles: the correct and uniform height of working surfaces; a circular work place; and a general “circular routing of working”, all carefully analysed to reduce the time and effort required in the preparation of meals. It was unveiled in 1929 at a Women's Exposition.