▁( 1 8 8 5 ) ▁was ▁the ▁first ▁to ▁coin ▁the ▁expression ▁in ert ial ▁frame ▁of ▁reference ▁and ▁" in ert ial ▁time ▁scale " ▁as ▁oper ational ▁rep lac ements ▁for ▁absolute ▁space ▁and ▁time ; ▁he ▁defined ▁" in ert ial ▁frame " ▁as ▁" a ▁reference ▁frame ▁in ▁which ▁a ▁mass ▁point ▁thrown ▁from ▁the ▁same ▁point ▁in ▁three ▁different ▁( non - co - plan ar ) ▁directions ▁follows ▁rect il ine ar ▁paths ▁each ▁time ▁it ▁is ▁thrown ". ▁In ▁ 1 9 0 2 , ▁Henri ▁Po inc ar é ▁published ▁a ▁collection ▁of ▁ess ays ▁titled ▁Science ▁and ▁Hyp oth esis , ▁which ▁included : ▁detailed ▁philosoph ical ▁discuss ions ▁on ▁the ▁relativ ity ▁of ▁space , ▁time , ▁and ▁on ▁the ▁conventional ity ▁of ▁distant ▁simultane ity ; ▁the ▁conject ure ▁that ▁a ▁viol ation ▁of ▁the ▁relativ ity ▁principle ▁can ▁never ▁be ▁detected ; ▁the ▁possible ▁non - ex istence ▁of ▁the ▁a ether , ▁together ▁with ▁some ▁arguments ▁supporting ▁the ▁a ether ; ▁and ▁many ▁remarks ▁on ▁non - E uclidean ▁vs . ▁E uclidean ▁geometry . ▁ ▁There ▁were ▁also ▁some ▁attempts ▁to ▁use ▁time ▁as ▁a ▁fourth ▁dimension . ▁This ▁was ▁done ▁as ▁early ▁as ▁ 1 7 5 4 ▁by ▁Jean ▁le ▁R ond ▁d ' A lem bert ▁in ▁the ▁Encyclop édie , ▁and ▁by ▁some ▁authors ▁in ▁the ▁ 1 9 th ▁century ▁like ▁H . ▁G . ▁Well s ▁in ▁his ▁novel ▁The ▁Time ▁Machine