The Supply Department.
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Selected Information which is likely to be of Interest to Makers, Owners, and their Buyers.
H.P.S.—Solid drawn square brass tubes, for the purpose you suggest, are obtainable from Cope, Allman and Co., Ltd., Unity Tube Works, Ickni?,k1 Square, l3ir
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Mr. John W. Bainbridge, 2, Fen Court, Fenchurch Street, W.C., wishes it to be known that he has been appointed agent in Great Britain and Ireland for the Bismarkhotte Steel Works of Berlin, except in the case of the London motorbus companies.
English-made "Mikes."
The British artificer is seldom at a loss for an apt description of any appliance which he may be called upon to use. Many mechanical components owe their descriptive names to the originality of sonic workman. To such a source we may, perhaps, trace such names as gudgeonpin, grasshopper frame, cod-pieces, spectacle plate, dumb iron, and many others that will occur to the reader. In a similar manner the now-familiar micrometer is usually known in the shops as a "mike." The rapid development of precision machine tools, and the increased output of interchangeable work has rendered the extensive use of accurate gauges and tools an absolute necessity. Precision micrometers, • treasured possessions of most good mechanics, have, hitherto, been mostly of foreign origin.To those who prefer to use British productions, wherever possible, it will be good news to hear that excellent instruments of this class are now being made throughout at the Lewisham works of Elliott Bros., whose head depo( is at 36, Leicester Square, W.C. The accuracy of the Elliott micrometer is largely traceable to the fact that its makers have kept in very close touch with the National Physical Laboratory at Teddington, during the standardization of their master gauges and standard screw threads. The 1 in. " mike," reading to thousandths and with a ratchet sensitive head, sells at a sovereign; this appears to us -to be a remarkably-good investment. The workmanship and finish are certainly equal to that of most of the well-known American and German instruments. A novel method of dividing the measuring head has been adopted throughout Elliott's models, and it will be found that this considerably facilitates the taking of a reading_ with rapidity. We reproduce a photograph, which clearly shows the improved style of division.