American LaFrance Chemical Unit. Body striping, hood lettering, lack of rear-mounted lanterns, and tank numbering indicate probability that it's Philadelphia, PA. Likely newer than 1919 since it has flat rear fenders - maybe 1923-1927. Great pic!
Truck at left is GMC.


Jesus Christ said, "I am the way and the truth and the life. No one comes to the Father except through me." John 14:6