Can't find if he invented it, but Bugatti had Sohc engine in 1908
Mainly, the difference is that in an overhead cam engine, the camshaft is mounted on the head of the engine, and the valves are still overhead, in an overhead valve engine (sometimes called a "pushrod motor"), the camshaft is in the crankcase.
Fewer moving valve train parts such as the push rods.
Overhead Camshaft
Double overhead camshaft
It is in the cylinder head.
Single overhead camshaft
The overhead projector was invented in the 1960's.
Single Overhead Camshaft
Mechanism with side camshaft and Mechanism with overhead camshaft both valve actuating mechanisms are used to operate inlet or exhaust valves.
how can i tell sohc or dohc
Do you mean Dual Overhead Cam and Overhead Valve. Overhead Valve has the camshaft positioned just above the Crankshaft in the block of the engine and uses Pushrods to actuate the valves. Overhead Cam(Single Camshaft) and Dual Overhead Cam(Twin Camshafts) have the Camshaft positioned in the head directly over the valves. As a rule of thumb OHV(Over Head Valve) engines have smaller and shorter heads while SOHC(Single Over Head Camshaft) and especially DOHC(Dual Over Head Camshaft) engines have much wider and taller heads to fit the camshafts and their accessories. Sometimes you can tell by spark plug positioning but this is not always accurate. Most OHV have the spark plugs on the sides of the heads with the distinct exception of HEMI heads. DOHC usually have the plugs in a North-South(Up-Down) arrangement.
Mechanism with side camshaft and Mechanism with overhead camshaft both valve actuating mechanisms are used to operate inlet or exhaust valves.