The correct spark plug and gap is crucial to proper ignition. Spark discharge is a breakdown in the air insulator between the electrode and ground. Yes - air is an insulator, a pretty good one at that. As voltage builds at the electrode, atoms in the air within the air gap gain electrons. This process is called ionization.
It's one of the reasons why our standard lenses are polycarbonate (thinner than standard lenses typically sold by other eyeglasses retailers). At Warby Parker, you can upgrade to high index lenses for an additional $30 whereas it typically costs $60 to $100 more.
In 1931 the Jenkins Television Radiovisor and Receiver Kit with a 3 magnyfing lens could be purchased for $ 115.45 ($1,769 in 2013 dollars). The Jenkins Television Model 200 Radiovisor and Receiver was designed for the living room. It had a finished walnut cabinet with an 8 picture and sold for $189.50.