. The Decorator's assistant. T> 1 2 problem X. To draw a tangent to a given circle, passingthrough a given point a. 1. When the point a is in the circumferenceof the circle. From the centre o draw the radius o through the point a draw c d perpen-dicular to o a, and it will be the tangentrequired. c ^4^ ^. (To be continued.) Lighting by Electricity.—Mr. Staitesnew Patent Electrical Lamp is said to go far-ther than heretofore in rendering electricallight available for practical purposes, as so longdesired. From a small battery power a compa-ratively large and steady as well as sustaine


. The Decorator's assistant. T> 1 2 problem X. To draw a tangent to a given circle, passingthrough a given point a. 1. When the point a is in the circumferenceof the circle. From the centre o draw the radius o through the point a draw c d perpen-dicular to o a, and it will be the tangentrequired. c ^4^ ^. (To be continued.) Lighting by Electricity.—Mr. Staitesnew Patent Electrical Lamp is said to go far-ther than heretofore in rendering electricallight available for practical purposes, as so longdesired. From a small battery power a compa-ratively large and steady as well as sustainedlight, is said to be thus produced. The inven-tor contemplates the application of his inven-tion to several purposes, amongst which aretelegraphing by flashes through coloured mediaand the instantaneous display of night signalsof the usual colours for danger, caution, &c.,at the required distances from the sealed, of course, under a glass,as long since suggested, this light would alsobe a great boon to miners. Mr. TreflFeys patent process for preservingwood consists in the employment of peroxideand perchloride of tin, and oxide, cliloride,and nitrate of copper. The wood to be impreg-nated is first soaked in a mixture of a poundof quick-lime with about four gallons, or elsein a s


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