The question asks which of the given automatic rain gauges provides a continuous graph of rainfall versus time. Let's go through the options and determine the correct answer:

1. Symons Gauge: This is a type of non-recording rain gauge which collects and measures the total amount of rainfall but does not provide a continuous record over time.

2. Non-recording Gauge: As the name suggests, this type of gauge does not record data automatically. It generally consists of a graduated cylinder to measure the total rainfall manually at specific intervals.

3. Float Type Recording Gauge: This gauge consists of a float that rises as rainfall is collected in a container. The movement of the float is recorded on a chart, producing a continuous graph of rainfall over time. It is an automatic system that provides a continuous and direct measurement of rainfall versus time.

4. Tipping Bucket Gauge: This is another type of automatic rain gauge that measures the rate of precipitation by counting the number of tips of the bucket after each incremental volume of rain. However, while it provides data on rainfall increments and intensity, it may not provide a smooth continuous graph like the float type gauge does.

Based on the explanations above, the Float Type Recording Gauge is the correct answer. It gives a continuous graph of rainfall versus time due to its float mechanism, which translates changes in water level into continuous movements recorded on a chart.