Question:  query regarding  manually made  incubator 
Answer: manually made incubator is good but one should give more emphasis on the proper temperature, humidity,& modulation of the setting & hatchaing trey at the time of incubation . improper jerking of trey( at definite  angle ) during incubation may lead to deformities of the pullet ,resulting the decrease growth ( in case of broiler )  & performance  ( in case of layer ))  in production time .