3 ms·
The weight would be high and lifting up, may not be feasible to all, especially young children. In contrast, having a rope that can be tugged, is a more practi
by kumarvvr 5y ago
The weight would be high and lifting up, may not be feasible to all, especially young children.
In contrast, having a rope that can be tugged, is a more practical solution.
Also, I wonder if such devices can be installed on village well walls, so that the time of the lamp is higher.