A more thorough explanation:

A roll of delegates is a list of people who are entitled to vote in a parliamentary meeting or convention. It is also known as a roll of members.

For example, in a political convention, the roll of delegates would be a list of all the delegates who are eligible to vote for the party's nominee.

In addition, a roll can also refer to a record of a court or public office's proceedings. It can also be an official list of people and property subject to taxation.

For instance, a court may keep a roll of all the cases it has heard, while a tax office may keep a roll of all the taxpayers in a particular area.

Overall, a roll of delegates is an important document that helps to ensure that only eligible voters participate in a meeting or convention.