Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.

Reprinted with permission from the April 30, 1978 reference issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage Works staff.