Typewriter Classifications
Sizes
Typewriters come in a few different sizes.
Standard
These are you "standard" desktop typewriters. Often big & heavy & hard to move.
Portable
These are usually about 1/2 to 1/3 the size of standard typewriters. They also come with cases for ease of portability. Not to be confused with standards with cases.
Ultraportable
The ultimate portable typewriters. Designed to be small and light and slim, often at the cost of any features (like a tabulator) and comfort.
Typebar Layout
Upstrike Typewriters
Upstrike typewriters are the first majorly successful typewriters manufactured, starting with the Sholes & Glidden AKA Remington Number 1. The typebars hang from the bottom of the machine and strike upwards towards the platen on the top. These machines often use 1 3/8" ribbon, and have right hand return levers. These are the oldest common found typewriters. These ceased manufacturing around 1905, with Remington ending the production of the Remington 7 & 8.
Front-strike/Visible Typewriters
These are the most common found typewriters found today. These were manufactured from around 1900 until today.
Down-stroke Typewriters
Downstroke typewriters type with the typebars above the platen, and the typebars swing down onto the platen. The most common example of this is the Oliver Typewriter.
Type Element/Type Shuttle Typewriters
These are typewriters that use a type element or type shuttle to print characters onto paper. Often the shuttles & elements are interchangeable, and you can change the pitch/size and typeface/style of the characters. Examples of this would be the Hammond Typewriter, Blickensderfer No. 6, and IBM Selectric.