Harvard Mark II

URI: https://gptkb.org/entity/Harvard_Mark_II
GPTKB entity
Statements (27)
Predicate Object
gptkbp:instanceOf electromechanical computer
gptkbp:alsoKnownAs gptkb:Aiken_Relay_Calculator
gptkbp:builtYear gptkb:Harvard_University
gptkbp:countryOfOrigin gptkb:United_States
gptkbp:designer gptkb:Howard_Aiken
gptkbp:fundedBy gptkb:United_States_Navy
https://www.w3.org/2000/01/rdf-schema#label Harvard Mark II
gptkbp:input punched tape
gptkbp:length about 60 feet
gptkbp:notableEvent September 9, 1947
origin of the term 'computer bug'
A moth was found in a relay, causing a malfunction, and was taped into the logbook as the 'first actual case of bug being found.'
gptkbp:numberOfRelays 13,000
gptkbp:output typewriter
gptkbp:predecessor gptkb:Harvard_Mark_I
gptkbp:speed add time: 0.125 seconds
faster than Harvard Mark I
multiply time: 0.750 seconds
gptkbp:status decommissioned
gptkbp:successor gptkb:Harvard_Mark_III
gptkbp:technology relay-based
gptkbp:usedFor military calculations
scientific calculations
gptkbp:weight approximately 24 tons
gptkbp:yearCompleted 1947
gptkbp:bfsParent gptkb:Mark_I_computer
gptkbp:bfsLayer 4