Funnel and receiver in non-recording type are typically placed inside a metal case.

Reasoning:
The placement of the funnel and receiver depends on the type of rain gauge being used. In the case of a non-recording type rain gauge, the funnel and receiver are placed inside a metal case for several reasons:

1. Protection: Placing the funnel and receiver inside a metal case provides protection against external factors such as wind, debris, and animals. The metal case acts as a shield, preventing any interference with the rain collection process.

2. Accuracy: By keeping the funnel and receiver inside a metal case, the rain gauge is shielded from any potential errors caused by wind turbulence or splashing. This ensures that the collected rainfall is more accurate and representative of the actual precipitation.

3. Durability: A metal case provides durability and longevity to the rain gauge setup. It protects the delicate components from physical damage and exposure to harsh weather conditions, thereby increasing the lifespan of the rain gauge.

4. Maintenance: Placing the funnel and receiver inside a metal case simplifies the maintenance process. The case can be easily accessed and opened for cleaning or calibration purposes. This ensures that the rain gauge remains in proper working condition and continues to provide accurate measurements.

Conclusion:
In summary, the funnel and receiver in a non-recording type rain gauge are placed inside a metal case primarily for protection, accuracy, durability, and ease of maintenance. The metal case acts as a shield, ensuring that external factors do not interfere with the rain collection process and that the collected rainfall measurements are reliable.