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The tunic and bobby-style helmet seem to have been a warm weather uniform. Contemporary photos of Chicago police in cooler weather show them dressed in overcoats with peaked caps (see page 10 and page 13).

Source:

Policeman John C. McGuire standing next to a brick wall [1907]. DN-0005134, Chicago Daily News negatives collection, Chicago History Museum; search the photo ID number at the American Memory web site for more information.)

The Cab-Hold-Up Affair / 9

The Muggings / 3

Another victim was Fred Nichols, aged 55, who was attacked at the corner of Johnson Street and West 18th Avenue, about a block west of South Halsted.

By now beat cops all over Chicago were looking for Campion's cab. At 4:30 a.m. one of them, Edward T. Murphy of the 22nd Street station, was on patrol at Archer and West 18th Streets when he saw a cab tearing south on South Halstead "at breakneck speed".

The crime spree had apparently turned into a drunken joy ride. Instead of surrepticiously trolling for victims the culprits were making themselves unnecessarily conspicuous.