|11 inch W. Rose wide London (top), 11 inch W. Rose Philadelphia (bottom)|
Source: Hamilton Builders website
"The blade of a London-pattern trowel has one curved edge for cutting bricks, a skill that takes practice to perfect; the blade's other edge is straight, for picking up mortar. You can buy left-handed versions of this trowel or opt for a similar trowel with two straight edges.
A Canadian-pattern trowel (sometimes called a Philadelphia brick trowel) is also symmetrical, having a wide blade with two curved edges."
Although this source is recent the definition is much older: Popular Mechanics Complete Home How-To, by Albert Jackson, David Day (2009)
|Approx. 100 years old|