In her witness statement, Mrs Fanny Mortimer, said that she heard "The Measured stamp of a policeman's beat". Does that mean policemen walked in a certain manner and you could pick out, that it was a policeman passing by? Could it also mean that policeman walked to a certain tempo, so that they met up at the same place, assuming that nothing significant had happened during the course of the beat?
Hi BB, quite probably both. Beat constables (opposed to 'fixed point') were trained to walk a 'measured tread' of precisely 2.5 miles per hour. That way their duty inspector would know their approximate location at any given moment. So their distinctive mechanical march was very much by design. (Source: Scotland Yard Investigates by Stewart Evans and Donald Rumbelow, two ex-coppers, and great historians of the case).
There were numerous press articles criticising the militarisation of the police under Warren, and suggesting they should spend less time on the parade ground practising their marching. The fixed beat time was said to give savvy criminals a distinct advantage. Although to be fair there are one or two mentions of individual PCs varying their beat or doubling back occasionally.
Police issue boots often came in for ridicule, notably from Punch, seemingly being built more for robustness than stealth or comfort - "The boots of Policemen have long been objects remarkable for their excessive clumsiness and disproportion." And also suggesting that they were more suited to kicking ruffians to the station than sneaking up on burglars (or killers) as "The tramp of the Bobbeian boots may readily be recognised full half a mile away". While this is doubtless hyperbole, the contemporary papers do contain many articles and letters imploring the police to wear rubber soled boots so they could move silently and thus avoid alerting criminals to their approach.
Here's an example of a PC (Watkins in an interview with the Star 1st Oct) mentioning a variation of his beat, both the direction and an alternate route (which he didn't use)
"I was working left-handed last night," said the police officer. "Sometimes I go into Mitre-square through the Church-passage, but last night I entered from Mitre-street. It was just half-past one when I turned out of Aldgate and passed round the next corner into the square. At that time there was nothing unusual to be seen." I looked carefully in all the corners, as I always do,
TURNING MY LANTERN
light in every direction. I am positive there was nothing wrong at that time."
"And when did you pass through the square again?" asked the reporter.