Show ile haw 0 9 o judge bichl ory engineers judge ot at the condition ot of their machinery by the tone tons it give gives out whilo running every engine whether stationary or locomotive has ba a p particular a a r I 1 ton a no a of f I 1 it t a 0 own wn the en gincer become becomes accustomed lo 10 that and any departure from rom it at once ex ti cite cites a suspicion thit that all Is 1 not right the engineer may not know what hat Is I 1 tie the mitter matter he may bave have no to ear tor for music but the change in the tone tons of his hl machine will be at once perceptible will be instantly recognized and will aart him on an immediate tour of investigation |