Form Feed would actually cause the printer to feed to the top of the next page. Original line printers had a carriage control tape that indicated to the printer where the top of the page was.
Also line printers using standard paper were 132 columns across and 66 lines down, which was 11 inches at 6 LPI. This matched the US portrait paper height and allowed for about 10 character per inch plus margins for the tractor feed and perforations.
I remember when a common (and relatively harmless) prank was to send a file with several thousand form feeds to the high speed "tree killer" printer at a remote site. Newbie operators would have a coronary when the fan-fold paper started spewing across the room.
("relatively harmless" because the paper wasn't actually printed on or otherwise damaged -- the operator just had to refold it and move it back to the input side).
Also line printers using standard paper were 132 columns across and 66 lines down, which was 11 inches at 6 LPI. This matched the US portrait paper height and allowed for about 10 character per inch plus margins for the tractor feed and perforations.