Whether the contract's reference to scales “in general use on Muskegon lake and river” meant the scale in use when the contract was made or the scale in use when the logs were measured.
Holding
The phrase referred to the scale generally in use at the time of scaling, so the Doyle scale governed if it was then the generally accepted standard.
Reasoning
The contract called for future performance and for measurement by professional third-party scalers. The natural expectation is that those scalers will apply the standards generally accepted in their trade when their services are actually required, rather than follow a superseded rule that may no longer be familiar or used.
The parties knew the existing Scribner scale when they made the agreement. If they intended that particular scale to control even after it ceased to be the local standard, they could have said so expressly. Without such language, the better inference is that the logs were to be measured as other logs were measured at that place and time.