In order that the spectators may understand the Henley signal system which will be used at the Harvard Invitation Regatta next Saturday and Monday, the following explanation has been issued by the Regatta Committee:

"The four signal uprights on Harvard Bridge represent the four courses to which crews and signals are assigned. The program of the races tells by number the crew and singles with their respective courses. These signals show the positions of the contestants at both Harvard Bridge and the finish, and also by how much a crew is leading in the following manner: The height of the signal represents one boat length. Thus, if the top of signal card 2 is opposite the middle of signal card 1, it shows that the boat on course 1 is one half a length ahead."

In addition to the bridge signals, the number given the winner will be carried on the referee boats.