Vintage recipe calls for yeast cakes

[vineyridge]

This was found often in my grandmother's cookbook. What would a 1930's yeast cake equal today?

 

[retired baker]

probably 1 oz.
if using cake yeast use ice cold liquids.
if using dry yeast use warm liquid.
if the recipe calls for 1 oz cake yeast use 1/2 oz of dry yeast.