From:John Yushkevich
Subject:RE: Police KJ Date:Mon Jan 14 08:35:52 2013
Response to:4498
Maybe a chain driven siren instead of the conventional wheel
driven one.

Picture and caption from the Los Angeles Herald-Examiner
newspaper; A police radio motorcycle, believed to be the first
without an operator in a side-car, were cruising Culver City
as a new weapon of crime prevention. Photo shows Officer L. O.
Lindsay with the compact motorcycle radio equipment which he
has invented. Photo dated: January 16, 1932.
Bike has several modifications,including the cut off chain
guard and drive output sprocket,any ideas on what it's for?