[Report of the Medical Officer of Health for London County Council] page -

London County Council 1899

[Report of the Medical Officer of Health for London County Council]

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Table: TABLE I.

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TABLE I.

No. and date of experiment.	Direction and force of wind.	Barometrical pressure.	Temperature.		Velocity of air current, in feet per second.	Vols, of CO2 per 10,000. Fresh air.	Vols, of CO2 per 10,000, Sewer air.	Organisms in 10 litres of fresh air.			Organisms in 10 litres of sewer air.			Remarks.
No. and date of experiment.	Direction and force of wind.	Barometrical pressure.	Shade.	Sewer.	Velocity of air current, in feet per second.	Vols, of CO2 per 10,000. Fresh air.	Vols, of CO2 per 10,000, Sewer air.	Moulds.	Bacteria.	Total.	Moulds.	Bacteria.	Total.	Remarks.
1893.
1. January 13th	N.E. strong.	30.01	-	55	Velocity of the air current determined with the anemometer varied from 5 ft. to 11 ft. per second.	-	28.25	Not determined.			1	4	5	The weather was too bad to make observations in fresh air on the 13th and 30th of January.
2. January 30th	S. strong.	30.04	-	55		-	14.56	Not determined.			5	15	20
3. March 8th	Calm.	30.33	60	51		2.54	15.77	28.5	9.0	37.5	5	14	19	Fine day.
4. March 13th	N.W. slight.	29.72	62	53		3.56	5.91	12.5	8.5	21.0	7	15	22	The sewer was fully charged,and the air was drawn from the penstock chamber, hence
5. August 30th	N.W. slight.	30.15	78	62		2.67	17.31	15.5	17	32.5	10	31.5	41.5	Fine day, but showery.

Table: TABLE II.

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TABLE II.

No. and date of experiment.	Barometrical pressure.	Temperature of sewer air.	Velocity of air current in feet per second.	Length of time sewer was kept full of sewage.	Lapse of time since sewer was emptied.	Vols. of CO2 per 10,000 Pump room air.	Organisms in 10 litres of pump room air.			Organisms in 10 litres of sewer air.			Remarks.
No. and date of experiment.	Barometrical pressure.	Temperature of sewer air.	Velocity of air current in feet per second.	Length of time sewer was kept full of sewage.	Lapse of time since sewer was emptied.	Vols. of CO2 per 10,000 Pump room air.	Moulds.	Bacteria.	Total.	Moulds.	Bacteria.	Total.	Remarks.
1893.
1. May 16th	29.82	64.0	5 ft.	24 hours	24 hours	3.32	28	18	46	15.5	18.5	34	Sewer was filled on May 14th at noon emptied May 15th
2. May 18th	29.60	60.75	5 ft.	24 hours	3 days	3.43	20.5	12	32.5	22.0	14	36	Sewer not re-filled since last experiment.
3. June 8th	30.36	61.50	5 ft.	29 hours	45 hours	4.58	47	17.5	64.5	37	10	47	Sewer re-filled on June 5th at 12 noon emptied on 6th at 5 p.m.
4. June 13th	29.98	62.0	5 ft.	29 hours	7 days	4.32	17.5	12	29.5	12.5	12.5	25	Sewer wa3 re-filled at 5 p.m. this day emptied at 11 a.m. on 14th.
5. June 16th	30.13	65.0	15 ft.	18 hours	2 days	5.60	2	15	17	1	14	15	Sewer not refilled until July.
6. July 13th	29.69	63.75	15 ft.	19 hours	24 hours	4.70	3.5	9	12.5	2	6.5	8.5	Sewer filled on July 11th at 5 p.m. emptied July 12th
7. July 18th	30.02	65.50	15 ft.	19 hours	6 days	4.50	9	12	21	12	24	36	Sewer not filled since July 12th.
8. July 21st	29.74	68.0	15 ft.	19 hours	9 days	3.82	7.5	23	30.5	23.5	12.5	36	Do. do.
9. July 27th	30.16	65.0	15 ft.	19 hours	12 days	8.14	19.5	24	43.5	45.5	19.5	65	Do. do.

Table: TABLE III

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TABLE III

No. and date of experiment.	Barometrical pressure.	Temperature of sewer air.	Velocity of air current in feet per second.	Vols, of CO, per 10,000. Pump room air.	Vols, of CO, per 10,000. Sewer air.	Organisms in 10 litres of pump room air.			Organisms in 10 litres of sewer air.			Remarks.
No. and date of experiment.	Barometrical pressure.	Temperature of sewer air.	Velocity of air current in feet per second.	Vols, of CO, per 10,000. Pump room air.	Vols, of CO, per 10,000. Sewer air.	Moulds.	Bacteria.	Total.	Moulds.	Bacteria.	Total.	Remarks.
1893.
1. Aug. 22nd	29.86	70	3 ft.	7.38	13.23	26.5	24.5	51	51.5	17.5	69	The sewer was filled with sewage to the level of the dam at 10.30 a.m. on the 21st.
2. Aug. 24th	30.07	67.5	3 ft.	4.56	6.61	47	31	78	86	37.5	123.5	Sewer open at both ends.
3. Aug. 28th	30.27	63.5	Very slight.	8.40	11.45	20	41	61	14.5	13	27.5
4. Sept. 1st	30.15	68	Do.	3.56	8.14	18.5	10.5	29	41	8	19	On August 30th two bucket-fuls of heavy deposit were placed in sewer.
5. Sept. 22nd	29.70	64	No current.	3.05	12.72	14.5	25.5	40	2	12.5	14.5	At the conclusion of the last experiment on Sept. 1st, two more bucketfuls of heavy deposit were added and both ends of the sewer were closed.
6. Oct. 5th	29.20	64.5	1 ft.	10.69	15.27	10	5	15	12.5	7	19.5