perhorsepower。Hisimportantstatementswithregardtothesetrialsarethatone—horsepowerwilltransportalargerweightattwentymilesanhourthanatten，andastilllargeratfortymilesthanattwenty，andsoon;that\"thesustainingpressureoftheaironaplanemovingatasmallangleofinclinationtoahorizontalpathismanytimesgreaterthanwouldresultfromtheformulaimplicitlygivenbyNewton，while，whereasinlandormarinetransportincreasedspeedismaintainedonlybyadisproportionateexpenditureofpowerwithinthelimitsofexperiment，inaerialhorizontaltransportthehigherspeedsaremoreeconomicalofpowerthanthelowerones。\"
ThisMr。Maximisevidentlyreadytoendorse，stating，inhisownwords，thatbirdsobtainthegreaterpartoftheirsupportbymovingforwardwithsufficientvelocitysoastobeconstantlyrestingonnewair，theinertiaofwhichhasnotbeendisturbed。Mr。Maxim’strialswereonascalecomparablewithallhismechanicalachievements。Heemployedforhisexperimentsarotatingarm，sweepingoutacircle，thecircumferenceofwhichwas200feet。Totheendofthisarmheattachedacigar—shapedapparatus，drivenbyascrew，andarrangedinsuchamannerthataero—planescouldbeattachedtoitatanyangle。Theseplaneswereonalargescale，carryingweightsoffrom20lbs。to100lbs。Withthiscontrivancehefoundthat，whateverpushthescrewcommunicatedtotheaero—plane，\"theplanewouldliftinaverticaldirectionfromtentofifteentimesasmuchasthehorizontalpushthatitreceivedfromthescrew，andwhichdependedupontheangleatwhichtheplanewasset，andthespeedatwhichtheapparatuswastravellingthroughtheair。\"Next，havingdeterminedbyexperimentthepowerrequiredtoperformartificialflight，Mr。
Maximappliedhimselftodesigningtherequisitemotor。\"I
constructed，\"hestates，\"twosetsofcompoundenginesoftemperedsteel，allthepartsbeingmadeverylightandstrong，andasteamgeneratorofpeculiarconstruction，thegreaterpartoftheheatingsurfaceconsistingofsmallandthincoppertubes。ForfuelIemployednaphtha。\"
ThisMr。Maximwrotein1892，addingthathewasthenexperimentingwithalargemachine，havingaspreadofover100