The Manufacturer and Builder Volume 6 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 Excerpt: ...should be 4 or 5 feet above the front row of seats. The raising of this platform alone to such a hight that every oue in the hall can plainly see the speakers without looking between heads, may perhaps remedy the whole evil. Sound waves lose much of their intensity when something is placed between the observer and the source of the sound, for instance, if a few score of heads intervene; and this is always the case If a great many hearers stand on a level floor, while the speaker is not sufficiently raised above them to bt plainly seen by all. 998 Destroying Plant Lice.--Florists recommend a de coction of quassia chips, 1 ounce in a gallon of water, while 2 ounces of soft soap is added. Put it on the plants In the evening, while the solution is tepid, and the next morning wash it oil by sprinkling the plants with clean water. 994 Artificial Meerschaum.--It is true. Artificial meerschaum is said to be made by soaking potatoes for two days in acidulated or alkaline water, cither one ounce of strong sulphuric acid or half an ounce of soda to the pint of water. They are then well washed with water and driedTor several days on a porous and moderately heated support. The best way to distinguish these dried potatoes from meerschaum is by the microscope. The inspection of as small a fragment as possible is the best, and the appearance is best studied by previous comparison of what you know to be the genuine article with the imitation. You can get the genuine meerschaum in all our large Eastern cities, from the manufacturers of pipes. 995 Florida Water.--The only practical difference is that most of the so-called Florida water smells slightly of cloves and cinnamon, which most Colognes do not. This is of course the result of the preparation, which is made according t...