He whānuitia te whakamahinga i roto i ngā mara pēnei i te tohu taiaho, te keri, te whakairo, te whakarewa, te tapahi, te maimoatanga mata, me ētahi atu. Ko ngā tawhā motuhake o tēnei hua me te whakamatao wai koia ēnei. Ka arotahi te whakaata mara i te taiaho kua whakakorikoria ki tētahi pūwāhi kotahi, ka whakanui ake i te kiato pūngao o te mārama taiaho. Ka whakamahia e ia te pūngao teitei o te taiaho ki te mahi i ngā momo tukatuka rauemi pēnei i te tapahi, te tohu, te whakarewa, te horoi, me te maimoatanga mata. I taua wā anō, ina huri te ahunga o te mārama taiaho taunga, ka taea tonu e te whakaata mara te pupuri i tētahi wāhi mārama me te rahi whanaunga me te kiato pūngao kāore i rerekē, ka taea ai e te mārama taiaho te tukatuka i ngā pūwāhi i ngā tūranga rauemi rerekē. Mā te whakakotahi i te whakaata mara me te galvanometer ka taea te huri tere me te tika i te ahunga o te mārama taiaho ki te rawhiti, ka taea te whakatutuki i te miihini me te tukatuka rauemi tere me te tika.
E 20 tau te roangaru e arotahi ana ki te whakarato i ngā hua whatu tino tika.