His book on ‘Magnetism and Electricity,’ published as one of Longman’s elementary series in 1873, marked a new departure in the exposition of electricity, as the first text-book containing a systematic application of the quantitative methods inaugurated by the British Association Committee on Electrical Standards. In 1883 the seventh edition was published, after there had already appeared two foreign editions, one in Italian and the other in German.
His papers on purely engineering subjects, though not numerous, are interesting and valuable. Amongst these may be mentioned the article ‘Bridges,’ written by him for the ninth edition of the ‘Encyclopædia Britannica,’ and afterwards republished as a separate treatise in 1876; and a paper ‘On the Practical Application of Reciprocal Figures to the Calculation of Strains in Framework,’ read before the Royal Society of Edinburgh, and published in the ‘Transactions’ of that Society in 1869. But perhaps the most important of all is his paper ‘On the Application of Graphic Methods to the Determination of the Efficiency of Machinery,’ read before the Royal Society of Edinburgh, and published in the ‘Transactions,’ vol. xxviii. (1876–78), for which he was awarded the Keith Gold Medal. This paper was a continuation of the subject treated in ‘Reulaux’s Mechanism,’ and, recognising the value of that work, supplied the elements required to constitute from Reulaux’s kinematic system a full machine receiving energy and doing work.
II. NOTE ON THE WORK OF FLEEMING JENKIN IN CONNECTION WITH SANITARY REFORM. BY LT. COL. ALEXANDER FERGUSSON.
IT was, I believe, during the autumn of 1877 that there came to Fleeming Jenkin the first inkling of an idea, not the least in importance of the many that emanated from that fertile brain, which, with singular rapidity, took root, and under his careful fostering expanded into a scheme the fruits of which have been of the utmost value to his fellow-citizens and others.
The phrase which afterwards suggested itself, and came into use, ‘Healthy houses,’ expresses very happily the drift of this scheme, and the ultimate object that Jenkin had in view.
In the summer of that year there had been much talk, and some newspaper correspondence, on the subject of the unsatisfactory condition of many of the best houses in Edinburgh as regards their sanitary state. One gentleman, for example, drew an appalling picture of a large and expensive house he had bought in the West-end of Edinburgh, fresh from the builder’s hands. To ascertain precisely what was wrong, and the steps to be taken to remedy the evils, the effects of which were but too apparent, obviously demanded the expenditure of much time and careful study on the part of the intelligent proprietor himself and the professional experts he had to call in, and, it is needless to add, much money. There came also, from the poorer parts of the town, the cry that in many cases the houses of our working people were built anyhow that the dictates of a narrow economy suggested to the speculative and irresponsible builder. The horrors of what was called the ‘Sandwich system,’ amongst other evils, were brought to light. It is sufficient to say, generally, that this particular practice of the builder consists in placing in a block of workmen’s houses, to save space and money, the water cisterns of one flat, directly under the sanitary appliances of the other, and so on to the top of a house of several storeys. It is easy to conceive the abominations that must ensue when the leakage of the upper floors begins to penetrate to the drinking water below. The picture was a hideous one, apart from the well-known fact that a whole class of diseases is habitually spread by contaminated water.