HELP ASAP I WILL GIVE BRAINLIST Instructions: Break the following section into unified sentences. You may need to drop or add a few words to maintain smooth transitions between sentences.

In 1879 J. P. Barrett, the election of the city of Chicago, invented an adjustment to the police and fire system-more especially the former-which was not only very ingenious but also greatly useful, and which consisted of a series of "patrol boxes" placed various parts of the city: say one, two, or even three for each block, according to the character of the various locations, which boxes had wires that connected them with the nearest police station; and whenever the police were needed, the box was opened and an alarm given by the pulling of a lever which signaled to the station an alarm and the number of the box.