What is a Brick Frog?
A brick frog is a distinctive indentation found on the top face of a brick. This seemingly small feature plays a crucial role in the construction process.
The Practical Purpose of a Brick Frog
Enhanced Bonding: The indentation provides a better grip for the mortar, creating a stronger and more durable bond between the bricks.
Reduced Weight: By removing a small amount of material, the brick becomes slightly lighter, making it easier to handle and transport.
A Unique Mark of Identity
The shape of the brick frog can often reveal a fascinating aspect of its history. During the era of convict transportation to Australia, each convict was assigned a quota of bricks to produce. To distinguish their work, many convicts imprinted unique marks or shapes, including the frog, into the wet clay. This practice allowed for identification of the brickmaker and served as a subtle form of personal expression in a harsh environment.
One of the most common marks found on old Australian bricks is the broad arrow. This symbol was used to designate items owned by the Crown and served as a deterrent against theft.
Convict-made bricks are a valuable piece of Australian history. Their unique characteristics, including the frog and often rough texture, make them highly sought after by collectors and builders.