its contacts and de denergizes the contactors cr 1 and cr 2 which in turn shut off the bulk bin feed screen and cross auger motors also when the unit in row 5 is filled to its proper level mercury switch mrs 2 reverses its contacts when time clock assembly tc 1 closes contacts on switch tcs r the relay ry 3 is energized closing all the contacts this gives a momentary start signal to each unit in a cage row by way of leads designated as top contactor and middle contactor for each row in fig8 which are connected to two terminals 96 on board 98 and through two cooperating terminals on contact end 94 leading to a motor unit 56 as a result each unit travels down the length of the complete cage row distributing feed each unit reverses itself at the end of the row and comes back to the front end making contact with all the contactors t 1 through t 5 m 1 through m 5 and b 1 through b 5 respectively the complete process is repeated again till the preset number of dumps are distributed to the birds time clock assembly tc 1 is set so that the units make 15 to 20 trips in a day depending on the amount of feed to be distributed to the birds when the units return to the starting end s and are being filled with feed for the next trip the battery on each unit is charged through the battery chargers bc 1 through bc 5 respectively mounted near the starting end s of each cage row in this regard the battery b of each mobile unit is charged by way of two leads designated top contactor and bottom contactor.