I recently saw this photograph taken in 1972 of a part demolished tenement block in Kelvinhaugh Street Glasgow. It is of interest because at a glance it shows how chimneys are constructed and how they remain separate, whilst feathering into a single chimney stack. It is a frequent misconception of customers that multiple fireplaces in a premises all join together to form one large chimney, that is where this photograph is useful in displacing that notion and informing them of what is actually going on in their house. It is also very instructive in showing how chimneys can have multiple turns in them, as many people think chimneys just run straight up and down. Looking at the lower chimneys in the Glasgow building, they have three turns in them. When manually sweeping the turns present the sweep with a challenge as the sweep has to constantly turn the brush to get it to go around the turn in the chimney. The sweep uses a technique to bend and turn the rod in a clockwise direction to get the brush to negotiate the turn. It is the torque in the rod that turns the brush and advances it up the chimney. It is this technique that also stops the brush undoing in the chimney.