Laboratory Workbench
The one thing about a mill laboratory which is very similar to the college laboratory is the desk or laboratory workbench for general operations which is present in one form or another in every laboratory. If the desk is to be placed in the middle of the room, it is usually a double desk; if […]
Laboratory Fume Hood
Upon nothing does the comfort of the inmates of a laboratory so much depend as upon the hood, and it is essential that this should “draw” well in order to carry off the fumes. Simple Laboratory Fume Hood Design Fig. 4 shows the simplest form of hood and one which will draw best of all, […]
Laboratory Sinks
In most college laboratories and in some large industrial ones the sinks are located in the middle or at the ends of the work benches. In a small laboratory, however, it will be found more convenient to have a separate table for the sink and it will save plumbing to fit this table up for […]
Analytical Laboratory Design & Equipment
In designing and equipping an analytical laboratory, two aims must be kept always in mind—First, to promote accuracy, and second, to economize time and labor. Don’t make the mistake of sacrificing the former unnecessarily to the latter, but always save time and labor when possible and to that end arrange your laboratory systematically. Nothing so […]
Assay Laboratory Instructions
These instruction sheets have been prepared in this form to take the place of mimeograph copies which were formerly used by students electing the course in fire assaying at the University of California. These notes are concise directions for the carrying out of certain laboratory work, and in no wise cover the ground of the […]
Diamond Drill Sampling Methods
In diamond-drill work, a true sample consists of all the material cut by the bit—both core and cuttings. As the recovery of this sample is the object of diamond drilling, the utmost care should be taken to secure it. Speed of drilling and low costs are of little value if an inaccurate sample is obtained. […]
How to Track & Control Metallurgy using Charts & Graphs
The graphic methods and records described in this article have been developed, with satisfactory results, for the use of executives of the Chino Copper Co., in Hurley,. N. Mex. Particular attention is directed to the use of large wall-charts, the quick reference display of large charts, the scale notation of metallurgical charts shown in Fig. […]
Effect of Forging on Steel Density
The writer has been unable to find much information relative to tests made to determine the effect of forging on the specific density of steel. The opinion, however, among men engaged in the business, seems to be that forging greatly compresses or consolidates the steel. While such is doubtless the case with spongy or porous […]
Charpy Impact Machine
Using a Charpy Impact Machine, we have done considerable work on notch-bar testing and are farther at sea now than when we started. So far, we have been unable to get the notch-bar test to be consistent with any other known test. Lately, I have been investigating the effect of the position of the notch-bar […]
Screen Scale for Testing Sieves
Since the adoption by the U. S. Bureau of Standards several years ago of specifications for standard 100- and 200-mesh sieves, frequent requests have been received that this Bureau test and certify sieves of other sizes than these. With a view to the adoption of a series of standard testing sieves which might be of […]