SPRAYING MIXTURES.

Colonist, Volume LX, Issue 14621, 28 January 1918, Page 3

SPRAYING MIXTURES.

A MEASUREMENT MATTER

An esteemed correspondent writes as follows on a question of measurements in the mixing of fruit and .ther sprays: — "

Orchardists, when using "Black Leaf 40" for spraying purposes, should bear~ in miiid that .the American pint and the American gallon are net the same measures as our pint and gallon. The Americans have two sets of fluid measures in use —one for beer, ,the other lor wines and spirits. In the latter, which is the one used by them in making tobacco spray solutions, 16 Huid ounces make cno pint, iind 8 of those pints make one gallon. If pure water be used, then one pint of it will weigh lib, and one gallon of it will weigh Sft and be equal to 128 ounces either t-y j weight or by measure. Now, our pint contains 20 fluid ounces, und the gallon 160 ounces. So with us

A pint of pure water Weighs a pound and a'quarter, And a gallon of water weighs just 101 b.

Our measures, therefore 5 hold 25 per cent more than the American ones do, or we may say that four of o\ir measures (pints,.quarts, or gallons) are equal to five of theirs.

Spray solutions may be made n\: by weight, by measure, or by a '■ombn.ition of both. A few examples will expitin this more fully.

j Here is a copy of Table JNo. 1, token from the label on a can of 'J3lacii Loaf 40":— A dilution of 1 to 800:— Black Leaf 40. Water. About 1$ teasp 1 gal. 1 fl. oz. (8 teasp.) S}- gal. 8%.f1. oz. (>- pint) r,() gal. 16 i!. oz. (1 pint) ... 100 gal. English equivalents for the above: — Black Leaf 40. Water. (a) 1 toaspoonful 5 pints. <b)". 1 fl. oz. (8 teasp.) : 5 gal v (c) S fl. oz. (2-5 pint) ... ... 40 gal.: (d) 16 fl. oz. (4-5 pint) ... 80- gal.: Remarks:

(a) 5 pints is equal to.#oo teaepecnfuls, for each pint contains 20 ounces, and each ounce is equal to 8 teaspoonfuls. ■

(b) 5 gallons is equal to 800 ounces either by measure or by weight, tor each gallon of water weighs 10lb. and each pound contains 16 ounces; or we may say each gallon contains 8 pints, and each pint 20 fluid ounces. (c) 8 fluid ounces, is equal to half a pound by weight, and 40 gallons is in weight equal to 800 half-pounds. j (d) For this is would be better to [substitute English measures entirely, using 1 pint (20 ounces) of fluid to 100 gallons of water.

The domestic teaspoon is not a reliable measure, as some hold" twice as much as others. A graduated medicine glass must be used instead.