Putting in the filter beds at the water works, Lawrence
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Filter beds showing spouts, Billerica Massachusetts
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Filter beds, Billerica Massachusetts
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Sudbury Department, Pegan Brook Filter-beds, Tool House, from the sout...
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Sudbury Department, Pegan Brook Filter-beds, Pump House, from the sout...
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Clinton Sewerage, furrows on Filter-bed No. 22, Lancaster, Mass., Nov....
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Clinton Sewerage, filter-beds, Section 1, Lancaster, Mass., May 17, 18...
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Sudbury Department, Marlborough Brook Filters, Storage bed No. 18, Mar...
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Sudbury Reservoir, Marlborough Brook Filters, natural Filter-bed No. 2...
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Sudbury Department, Marlborough Brook Filters, Filter-beds Nos. 5, 6, ...
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Clinton Sewerage, filter-beds, Section 1, Lancaster, Mass., May 17, 18...
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Sudbury Reservoir, Marlborough Brook Filters, natural Filter-bed No. 2...
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Clinton Sewerage, filter-beds, Section 1, Lancaster, Mass., May 17, 18...
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Clinton Sewerage, furrows on Filter-bed No. 18, Lancaster, Mass., Nov....
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Sudbury Department, Marlborough Brook Filters, Filter-beds Nos. 19, 24...
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Sudbury Reservoir, Marlborough Brook Filters, diverting weir, Marlboro...
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Sudbury Reservoir, Marlborough Brook Filters, natural Filter-bed No. 2...
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Sudbury Reservoir, Marlborough Brook Filters, artificial Filter-bed No...
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Sudbury Reservoir, Marlborough Brook Filters, natural Filter-bed No. 1...
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Sudbury Reservoir, Marlborough Brook Filters, gravel washer, Marlborou...
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Clinton Sewerage, filter-beds, Section 1, Lancaster, Mass., May 17, 18...
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Clinton Sewerage, outlet into Filter-bed, Section 1, Lancaster, Mass.,...
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Sudbury Department, Marlborough Brook Filters, Filter-beds Nos. 21, 23...
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Sudbury Department, Marlborough Brook Filters, diverting weir, Marlbor...
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Sudbury Department, Marlborough Brook Filters, Branch Channel B, Marlb...
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Clinton Sewerage, filter-beds, Section 1, Lancaster, Mass., May 17, 18...
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Sudbury Reservoir, Marlborough Brook Filters, gravel bank, Filter-bed ...
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Sudbury Reservoir, Marlborough Brook Filters, gravel washer, Marlborou...
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Clinton Sewerage, inlet to Filter-bed No. 26, Lancaster, Mass., Sep. 2...
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Sudbury Reservoir, Marlborough Brook Filters, artificial Filter-beds, ...
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Sudbury Department, Marlborough Brook Filters, Filter-beds Nos. 1, 2, ...
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Clinton Sewerage, furrows on Filter-bed No. 26, Lancaster, Mass., Nov....
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Paesiello Emerson - Filter beds, Spencer, Spencer Massachusetts
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Men from the water department clearing the filter beds and the pumping...
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Filter beds at Andover, Massachusetts, Billerica Massachusetts
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Filter beds, Andover, Massachusetts, Billerica Massachusetts
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Filter beds showing corn stubs, Andover, Massachusetts, Billerica Mass...
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Filter beds showing spouts, Billerica Massachusetts
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Filter beds showing sludge beds, Andover, Massachusetts, Billerica Mas...
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Filter beds showing screens, Billerica Massachusetts
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Filter beds from Lowell Street, Billerica Massachusetts
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Sudbury Department, Pegan Filters, Pumping Station and surroundings, N...
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Sudbury Department, Pegan Filters, Pumping Station, Natick, Mass., Nov...
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Sudbury Department, Pegan Filter-beds, Natick, Mass., May 20, 1903
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Sudbury Department, Pegan Filters, Pumping Station, Natick, Mass., Nov...
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Sudbury Department, Pegan Filters, Pumping Station, Natick, Mass., Nov...
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Filter beds showing screens, Billerica Massachusetts
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Clinton Sewerage, filter-beds, Lancaster, Mass., Nov. 1, 1904
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Clinton Sewerage, filter-beds, Lancaster, Mass., Nov. 1, 1904
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Clinton Sewerage, filter-beds, Lancaster, Mass., Nov. 1, 1904
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Clinton Sewerage, filter-beds, Lancaster, Mass., Nov. 1, 1904
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Clinton Sewerage, filter-beds, Lancaster, Mass., Nov. 1, 1904
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Wachusett Reservoir, top layer of Filter-bed No. 4, Sterling, Mass., N...
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Wachusett Reservoir, Filter-beds Nos. 3 and 4, on brook emptying into ...
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Wachusett Reservoir, filter-beds, looking northeast, Sterling, Mass., ...
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Wachusett Reservoir, Filter-beds Nos. 1 and 2, from the south, Sterlin...
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Wachusett Reservoir, relocation of brook south of Filter-bed No. 4, St...
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Wachusett Reservoir, Filter-bed No. 3, looking north, Sterling, Mass.,...
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Wachusett Reservoir, Filter-bed No. 1, looking north, Sterling, Mass.,...
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Wachusett Reservoir, head of feeder ditch, Sterling, Mass., Nov. 23, 1...
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Wachusett Reservoir, ditch south of Filter-beds Nos. 3 and 4, Sterling...
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Wachusett Reservoir, general view of filter-beds, looking northeast, S...
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Wachusett Reservoir, upstream face of dam at Filter-beds, Sterling, Ma...
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Wachusett Reservoir, downstream face of dam at filter-beds, Sterling, ...
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Wachusett Reservoir, filter-beds, looking north, Sterling Junction, St...
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Wachusett Reservoir, general view of filter-beds, Sterling, Mass., Jun...
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Wachusett Reservoir, filter-beds, bottom of bed, Sterling Junction, St...
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Wachusett Reservoir, general view of filter-beds, Sterling, Mass., Jun...
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Wachusett Reservoir, ditch east of filter-beds, Sterling, Mass., Jun. ...
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Wachusett Reservoir, filter-beds, drainage ditch, Sterling Junction, S...
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Wachusett Reservoir, downstream face of dam at filter-beds, Sterling, ...
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Wachusett Reservoir, filter-beds and drainage ditch, Sterling Junction...
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Wachusett Reservoir, watering trough near dam at filter-beds, Sterling...
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Wachusett Department, Clinton Sewerage filter-beds, showing method of ...
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Wachusett Department, Clinton Sewerage filter-beds, condition of bed a...
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Wachusett Department, Clinton Sewerage filter-beds, condition of bed a...
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Wachusett Department, Clinton Sewerage filter-beds, showing wooden dis...
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Wachusett Reservoir, filter-beds, small slides of March 25, 1909, in e...
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Wachusett Department, Clinton Sewerage filter-beds, showing inlet and ...
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Wachusett Reservoir, filter-beds, small slides of March 25, 1909, in e...
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Sudbury Department, Hopkinton Reservoir, Filter-beds, Ashland, Mass., ...
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Sudbury Department, filter-bed below Southborough swimming pool, Bosto...
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The walls of the filter beds and sedimentation basin at this modern fi...
Department of Water Works, Michigan City, Indiana. Mr. H.J. Draves, Supt. of the Filtration Plan shown on the opposite side, reports that Ramuc Enamel has proven very satisfactory and assisted him materially in... More