The spelling of the phrase "one thirty sixth of yard" can be a bit tricky. The phonetic transcription in IPA would be /wʌn ˈθɜːti sɪksθ əv jɑːd/. The "th" sound in "thirty" and "sixth" is pronounced with the voiceless dental fricative /θ/. The "f" sound in "of" changes to a voiced consonant /v/ when followed by a vowel sound, like in "yard." Paying attention to these phonetic details can help improve spelling accuracy.