monkey board
n.β Β«He pursued the poling system down Ludgate-hill, and there he came so close that the pole struck complainantβs legs, knocked him off the “monkey board,” or conductorβs stand, and while he was lying on the the ground bawled out that it served him right.Β» βin Guildhall London Times Sept. 23, 1836. (source: Double-Tongued Dictionary)