Harrison's marine timekeepers

GPTKB entity

Predicate	Object
gptkbp:instanceOf	gptkb:marine_chronometer
gptkbp:awardedBy	gptkb:Board_of_Longitude
gptkbp:date_of_first_model	1735
gptkbp:displayedAt	gptkb:National_Maritime_Museum,_Greenwich
gptkbp:fifth_model	H5
gptkbp:firstModel	gptkb:H1
gptkbp:fourth_model	H4
gptkbp:H1_dimensions	approx. 1m x 0.5m x 0.5m
gptkbp:H1_type	gptkb:castle
gptkbp:H1_weight	34 kg
gptkbp:H4_completed	1759
gptkbp:H4_type	gptkb:wristwatch
gptkbp:H4_won_longitude_prize	true
gptkbp:influenced	development of marine chronometers
gptkbp:inventedBy	gptkb:John_Harrison
gptkbp:location_of_original_models	gptkb:Royal_Observatory,_Greenwich
gptkbp:material	gptkb:wood brass
gptkbp:notableModel	H4
gptkbp:purpose	solving the longitude problem
gptkbp:second_model	H2
gptkbp:significance	enabled accurate determination of longitude at sea
gptkbp:technology	bimetallic strip grasshopper escapement remontoire
gptkbp:third_model	H3
gptkbp:bfsParent	gptkb:National_Maritime_Museum,_Greenwich gptkb:National_Maritime_Museum_collection
gptkbp:bfsLayer	7
http://www.w3.org/2000/01/rdf-schema#label	Harrison's marine timekeepers