Wash cucumbers, slice 1/8 inch of each ends. Cut cucumbers in 1/4 inch clockwise slices.
Combine vinegar, salt, celery, and mustard seeds in a large kettle. Bring mixture to boiling.
Place 2 slices onions and 1 dill head in each of 8 hot pint jars. Pack cucumbers slices into jars. Place 1 slice of onion and 1 head dill on top. Pour boiling liquid over cucumber filling to within 1/4 inch from top. Adjust lids.
Process in boiling water 15 minutes. Start to count processing time as soon as jars are placed in actively boiling water. Remove jars. Cool on wire racks 12 to 24 hours. Check jars for airtight seal.
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