On most current clocks the horn sounds at 0.0 that would mean if the clock was stopped at showed 0.1 then the time would be somewhere greater than 0.0 but less than or equal to 0.1 therefore if the clock shows 0.3 the time would be somewhere from greater than 0.2 to less than or equal to 0.3 In short it would be 0.3 or less which in turn matches up with the wording of the rule. If the clock didn't work like this then it would be a full tenth after 0.0 was displayed until the horn.
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