Final answer:
The provided text does not specify who employed Tom, Wilkie, and Timothy Wallace to build a ditch. The passages discuss different contexts and historical figures, including water projects by William Mulholland but do not contain information about the employment of these three individuals for ditch construction.
Step-by-step explanation:
The individual who employed Tom, Wilkie, and Timothy Wallace to build a ditch does not appear to be explicitly mentioned in the given references. The passages provided do talk about various individuals named Tom or involving tasks such as haymaking or slave labor, but none of these fragments provide a direct answer to the question regarding the employment for the construction of a ditch. However, one significant historical figure related to notable water projects is William Mulholland, who was the head of the Los Angeles Department of Water and Power and is known for the planning and construction of an aqueduct. Although Mulholland's story is a relevant and interesting piece of history concerning engineering feats and tragic failures, it does not answer the specific question about who employed Tom, Wilkie, and Timothy Wallace.