| OCR Text |
Show 5796 3797- A This sampler is so make as to hold a pint milk bottle, and it has a weight which is placed in the bottom of the sampler so as to hold the sampler in a vertical position, or as nearly as possible in a vertical position. So take an ordinary pint milk bottle and punch a hole five- eighths of an inch in diameter in the cap, and cover this cap with a piece of wrapping paper. And the bottle is put into the sampler, and the sampler is lowered to the desired depth. We start in by taking samples from the bottom of the river, and take some from the middle depth, and some at the surface. We hold the bottle at the desired depth, and in order to do so, we pro-vided a second weight, which weighed about three- quarter of a pound, I believe, which would slide down on a wire and push a plunger down. The best samples we have found for our pur-poses to give a good idea of a stream are to have this bottle at the bottom of the river, and start pulling it up at such a rate that the bottle shall be full just as it got to the top. In the way get an integrated sample, getting a little water from every depth. Now, I spoke of silt samples and water samples. In addi-tion to silt samples we would take water samples which were primarily for the determination of the dissolved mineral |
