Ha ha. Good one, Doctor.
Kevin, think of it this way. You need three things to start your car. Compression, spark at the right time, and fuel. The starter spinning the engine provides the compression and rotates the distributor to give you spark at the right time. The spark comes from the ignition (i.e. coil distributor, points and spark plugs). Spinning the engine also runs the mechanical fuel pump and and sucks fuel from your carbs.
The starter and ignition are entirely different circuits, so they both have to be switched on for the car to start. If you have an electric fuel pump to push fuel, that is on the same circuit as the ignition, so both are turned on at the same time.
The exception is when your battery is dead and you push start your car. In that case momentum turns the engine over providing compression and power to the ignition is supplied by the genny.
The last vehicle I saw with a foot operated starter switch was my grandfather's 1954 Chevy pickup. But tractors had separate starter and ignition switches (just like the Bugeye) for years after that.
Referring to TOC's comment about safety interlock switches, starting in 1939 the Ford tractor transmissions were set up so that the gearshift had to be in neutral in order for the starter button to be pushed. They were way ahead of the automobile industry in this regard. This safety feature prevented many a farmer from getting run over by his own machine, which was not an uncommon cause of death, and is not unheard of even today.
Who here hasn't tried to start their car in gear with the ignition on? These cars are geared so much higher than a tractor it would seem unlikely one would take off on you. But in some cases there is something positive to be said about safety interlocks.
I'm 54 too. And try not do do anything stupid around machines so I will be around for the next 30 years, minimum.
Charlie
1960 Bugeye
1949 Ford 8N tractor
1952 Ford 8N tractor
And I don't even want you to know what my daily driver is.