You use a brick trowel to apply mortar to bricks. Specifically, you use the blade to pick up mortar and apply it to the side of the brick that will be in contact with the previously laid bricks. You also use it to pick up mortar once a course of bricks is complete.
Here's a more detailed breakdown:
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Loading the Trowel: Use the trowel to scoop mortar from your mortar board or hawk. Practice getting a feel for the right amount of mortar needed for each brick.
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Applying Mortar to the Brick: Using the blade, apply the mortar to the edge of the brick that will be laid.
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Cleaning: After you have laid the bricks, you can use the trowel to scrape away excess mortar.