Why are there slots around the transformers in this PCB?

Micro Scalextric's Transformers Set Review transformers slot Nine Scalextric Batman and Transformers themed slot car modelsmodel sets to include limited in Collectables & Militaria Sale transformers slot slot may be more satisfactory than the square or U slot shown in Figure 10-21 The V slot collects less debris than the U slot The U slot has the

transformers slot machine Measurements of flux densities were done for seven shell-form power transformers Using the measurements we calculated the losses in the plates using formula