The intensifier as used in connection with hydraulic apparatus was patented in the year 1869 by Mr. Aschroft, but the principle upon which it works is very much older. Intensifiers are made both single and double acting. PERCENTAGE OF THE TOTAL AMOUNT OF WATER TAKEN FROM THE RESERVOIR. | Elevation of discharge above | delivery valve of ram in feet. Height +------+------+------+------+------ of fall | 15 | 18 | 21 | 24 | 27 in feet.+------+------+------+------+------ | Percentage. --------+------+------+------+------+------ 2 | ·0724| ·0583| ·0402| ·0307| ·0255 3 | ·1327| ·1020| ·0807| ·0651| ·0532 4 | ·1960| ·1535| ·1234| ·1020| ·0854 5 | ·2614| ·2068| ·1686| ·1404| ·1189 6 | ·3282| ·2614| ·2146| ·1800| ·1535 7 | ·3960| ·3170| ·2614| ·2203| ·1885 8 | ·4647| ·3733| ·3090| ·2614| ·2248 9 | ·5341| ·4303| ·3572| ·3030| ·2614 10 | ·6040| ·4877| ·4058| ·3450| ·2984 11 | ·6745| ·5459| ·4549| ·3874| ·3357 12 | ·7453| ·6040| ·5043| ·4302| ·3733 13 | ·8166| ·6627| ·5540| ·4732| ·4112 14 | ·8881| ·7217| ·6040| ·5166| ·4494 15 | ·9600| ·7809| ·6543| ·5601| ·4877 16 | -- | ·8404| ·7048| ·6040| ·5263 17 | -- | ·9001| ·7555| ·6480| ·5650 18 | -- | ·9600| ·8064| ·6921| ·6040 19 | -- | -- | ·8574| ·7364| ·6430 20 | -- | -- | ·9086| ·7800| ·6823 21 | -- | -- | ·9600| ·8254| ·7217 22 | -- | -- | -- | ·8701| ·7612 23 | -- | -- | -- | ·9150| ·8007 24 | -- | -- | -- | ·9600| ·8404 --------+------+------+------+------+------ | Elevation of discharge above | delivery valve of ram in feet. Height +------+------+------+------+------ of fall | 30 | 35 | 40 | 45 | 50 in feet.+------+------+------+------+------ | Percentage. --------+------+------+------+------+------ 2 | ·0181| ·0112| ·0063| ·0027| -- 3 | ·0441| ·0326| ·0243| ·0181| ·0132 4 | ·0724| ·0560| ·0441| ·0348| ·0281 5 | ·1020| ·0807| ·0652| ·0533| ·0441 6 | ·1327| ·1063| ·0870| ·0724| ·0608 7 | ·1640| ·1327| ·1096| ·0920| ·0782 8 | ·1960| ·1595| ·1327| ·1121| ·0960 9 | ·2285| ·1868| ·1561| ·1327| ·1142 10 | ·2614| ·2145| ·1800| ·1535| ·1327 11 | ·2947| ·2425| ·2041| ·1746| ·1514 12 | ·3282| ·2708| ·2285| ·1960| ·1704 13 | ·3620| ·2994| ·2532| ·2177| ·1896 14 | ·3960| ·3282| ·2780| ·2395| ·2090 15 | ·4303| ·3572| ·3030| ·2614| ·2285 16 | ·4647| ·3863| ·3282| ·2835| ·2482 17 | ·4993| ·4157| ·3535| ·3058| ·2680 18 | ·5341| ·4451| ·3790| ·3232| ·2380 19 | ·5690| ·4746| ·4046| ·3507| ·3081 20 | ·6040| ·5042| ·4303| ·3733| ·3282 21 | ·6392| ·5340| ·4561| ·3960| ·3486 22 | ·6745| ·5640| ·4820| ·4188| ·3688